20785073764 has 48 divisors (see below), whose sum is σ = 45720396288. Its totient is φ = 8047709568.

The previous prime is 20785073741. The next prime is 20785073773. The reversal of 20785073764 is 46737058702.

It is a happy number.

It is a super-2 number, since 2×20785073764² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590359 + ... + 624574.

It is an arithmetic number, because the mean of its divisors is an integer number (952508256).

Almost surely, 2^20785073764 is an apocalyptic number.

It is an amenable number.

20785073764 is an abundant number, since it is smaller than the sum of its proper divisors (24935322524).

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

20785073764 is a wasteful number, since it uses less digits than its factorization.

20785073764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215004 (or 1215002 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 20785073764 in words is "twenty billion, seven hundred eighty-five million, seventy-three thousand, seven hundred sixty-four".