20857831624 has 64 divisors (see below), whose sum is σ = 47812584960. Its totient is φ = 8326471680.

The previous prime is 20857831613. The next prime is 20857831627. The reversal of 20857831624 is 42613875802.

It is not an unprimeable number, because it can be changed into a prime (20857831627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20592 + ... + 205279.

It is an arithmetic number, because the mean of its divisors is an integer number (747071640).

Almost surely, 2^20857831624 is an apocalyptic number.

It is an amenable number.

20857831624 is an abundant number, since it is smaller than the sum of its proper divisors (26954753336).

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

20857831624 is a wasteful number, since it uses less digits than its factorization.

20857831624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225998 (or 225994 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 20857831624 in words is "twenty billion, eight hundred fifty-seven million, eight hundred thirty-one thousand, six hundred twenty-four".