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20906254 = 217895843
BaseRepresentation
bin100111111000…
…0000100001110
31110100010222201
41033300010032
520323000004
62024032114
7342462115
oct117600416
943303881
1020906254
111088a1a6
12700263a
13443ca85
142ac2c7c
151c7e6a4
hex13f010e

20906254 has 8 divisors (see below), whose sum is σ = 31382280. Its totient is φ = 10445496.

The previous prime is 20906239. The next prime is 20906257. The reversal of 20906254 is 45260902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (3922785).

Almost surely, 220906254 is an apocalyptic number.

20906254 is a deficient number, since it is larger than the sum of its proper divisors (10476026).

20906254 is a wasteful number, since it uses less digits than its factorization.

20906254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7634.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20906254 is about 4572.3357269562. The cubic root of 20906254 is about 275.4812685510.

The spelling of 20906254 in words is "twenty million, nine hundred six thousand, two hundred fifty-four".

Divisors: 1 2 1789 3578 5843 11686 10453127 20906254