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20672211 = 37984391
BaseRepresentation
bin100111011011…
…0111011010011
31102220020221110
41032312323103
520243002321
62015024403
7340465560
oct116667323
942806843
1020672211
111073a37a
126b0b103
13438a3a1
142a61867
151c35176
hex13b6ed3

20672211 has 8 divisors (see below), whose sum is σ = 31500544. Its totient is φ = 11812680.

The previous prime is 20672131. The next prime is 20672227. The reversal of 20672211 is 11227602.

Adding to 20672211 its reverse (11227602), we get a palindrome (31899813).

It can be divided in two parts, 2067 and 2211, that added together give a triangular number (4278 = T92).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20672211 - 27 = 20672083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 984391 = 20672211 / (2 + 0 + 6 + 7 + 2 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20672231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492175 + ... + 492216.

It is an arithmetic number, because the mean of its divisors is an integer number (3937568).

Almost surely, 220672211 is an apocalyptic number.

20672211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20672211 is a deficient number, since it is larger than the sum of its proper divisors (10828333).

20672211 is an equidigital number, since it uses as much as digits as its factorization.

20672211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984401.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20672211 is about 4546.6703201354. The cubic root of 20672211 is about 274.4494151996.

The spelling of 20672211 in words is "twenty million, six hundred seventy-two thousand, two hundred eleven".

Divisors: 1 3 7 21 984391 2953173 6890737 20672211