20957850 has 36 divisors (see below), whose sum is σ = 56307966. Its totient is φ = 5588640.

The previous prime is 20957837. The next prime is 20957861. The reversal of 20957850 is 5875902.

It can be written as a sum of positive squares in 3 ways, for example, as 8277129 + 12680721 = 2877^2 + 3561^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22837 + ... + 23736.

Almost surely, 2^20957850 is an apocalyptic number.

20957850 is an abundant number, since it is smaller than the sum of its proper divisors (35350116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20957850 is a wasteful number, since it uses less digits than its factorization.

20957850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46591 (or 46583 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 20957850 is about 4577.9744429169. The cubic root of 20957850 is about 275.7077088388.

It can be divided in two parts, 209578 and 50, that added together give a triangular number (209628 = T₆₄₇).

The spelling of 20957850 in words is "twenty million, nine hundred fifty-seven thousand, eight hundred fifty".