20857737468 has 12 divisors (see below), whose sum is σ = 48668054120. Its totient is φ = 6952579152.

The previous prime is 20857737451. The next prime is 20857737497. The reversal of 20857737468 is 86473775802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20857737468² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869072383 + ... + 869072406.

Almost surely, 2^20857737468 is an apocalyptic number.

It is an amenable number.

20857737468 is an abundant number, since it is smaller than the sum of its proper divisors (27810316652).

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

20857737468 is a wasteful number, since it uses less digits than its factorization.

20857737468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738144796 (or 1738144794 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 57.

The spelling of 20857737468 in words is "twenty billion, eight hundred fifty-seven million, seven hundred thirty-seven thousand, four hundred sixty-eight".