20761752664 has 32 divisors (see below), whose sum is σ = 39152513520. Its totient is φ = 10321145856.

The previous prime is 20761752659. The next prime is 20761752679. The reversal of 20761752664 is 46625716702.

It is a super-2 number, since 2×20761752664² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 4062799 + ... + 4067905.

Almost surely, 2^20761752664 is an apocalyptic number.

It is an amenable number.

20761752664 is a deficient number, since it is larger than the sum of its proper divisors (18390760856).

20761752664 is a wasteful number, since it uses less digits than its factorization.

20761752664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7939 (or 7935 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

It can be divided in two parts, 207617 and 52664, that added together give a triangular number (260281 = T₇₂₁).

The spelling of 20761752664 in words is "twenty billion, seven hundred sixty-one million, seven hundred fifty-two thousand, six hundred sixty-four".