20357531772 has 12 divisors (see below), whose sum is σ = 47500907496. Its totient is φ = 6785843920.

The previous prime is 20357531759. The next prime is 20357531791. The reversal of 20357531772 is 27713575302.

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

It is a congruent number.

It is an unprimeable number.

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, 848230479 + ... + 848230502.

It is an arithmetic number, because the mean of its divisors is an integer number (3958408958).

Almost surely, 2^20357531772 is an apocalyptic number.

It is an amenable number.

20357531772 is an abundant number, since it is smaller than the sum of its proper divisors (27143375724).

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

20357531772 is a wasteful number, since it uses less digits than its factorization.

20357531772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696460988 (or 1696460986 counting only the distinct ones).

The product of its (nonzero) digits is 308700, while the sum is 42.

The spelling of 20357531772 in words is "twenty billion, three hundred fifty-seven million, five hundred thirty-one thousand, seven hundred seventy-two".