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20000001 = 37952381

20000001 has 8 divisors (see below), whose sum is σ = 30476224. Its totient is φ = 11428560.

The previous prime is 19999999. The next prime is 20000003. The reversal of 20000001 is 10000002.

Adding to 20000001 its reverse (10000002), we get a palindrome (30000003).

Subtracting from 20000001 its reverse (10000002), we obtain a palindrome (9999999).

Multipling 20000001 by its reverse (10000002), we get a palindrome (200000050000002).

It is an interprime number because it is at equal distance from previous prime (19999999) and next prime (20000003).

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

It is not a de Polignac number, because 20000001 - 21 = 19999999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (3).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20000003) 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, 476170 + ... + 476211.

It is an arithmetic number, because the mean of its divisors is an integer number (3809528).

Almost surely, 220000001 is an apocalyptic number.

20000001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20000001 is a deficient number, since it is larger than the sum of its proper divisors (10476223).

20000001 is an equidigital number, since it uses as much as digits as its factorization.

20000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952391.

The product of its (nonzero) digits is 2, while the sum is 3.

The square root of 20000001 is about 4472.1360668030. The cubic root of 20000001 is about 271.4417661835.

The spelling of 20000001 in words is "twenty million, one", and thus it is an aban number and an uban number.

Divisors: 1 3 7 21 952381 2857143 6666667 20000001