20857845624 has 256 divisors, whose sum is σ = 68024448000. Its totient is φ = 5170851840.

The previous prime is 20857845607. The next prime is 20857845647. The reversal of 20857845624 is 42654875802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4767502 + ... + 4771874.

It is an arithmetic number, because the mean of its divisors is an integer number (265720500).

Almost surely, 2^20857845624 is an apocalyptic number.

20857845624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20857845624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34012224000).

20857845624 is an abundant number, since it is smaller than the sum of its proper divisors (47166602376).

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

20857845624 is a wasteful number, since it uses less digits than its factorization.

20857845624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4518 (or 4514 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 51.

The spelling of 20857845624 in words is "twenty billion, eight hundred fifty-seven million, eight hundred forty-five thousand, six hundred twenty-four".