20857713504 has 24 divisors (see below), whose sum is σ = 54751498200. Its totient is φ = 6952571136.

The previous prime is 20857713493. The next prime is 20857713509. The reversal of 20857713504 is 40531775802.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×20857713504² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857713509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108633829 + ... + 108634020.

It is an arithmetic number, because the mean of its divisors is an integer number (2281312425).

Almost surely, 2^20857713504 is an apocalyptic number.

20857713504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20857713504 is an abundant number, since it is smaller than the sum of its proper divisors (33893784696).

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

20857713504 is a wasteful number, since it uses less digits than its factorization.

20857713504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217267862 (or 217267854 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 20857713504 in words is "twenty billion, eight hundred fifty-seven million, seven hundred thirteen thousand, five hundred four".