20372542664 has 8 divisors (see below), whose sum is σ = 38198517510. Its totient is φ = 10186271328.

The previous prime is 20372542639. The next prime is 20372542669. The reversal of 20372542664 is 46624527302.

It can be written as a sum of positive squares in only one way, i.e., 18815608900 + 1556933764 = 137170^2 + 39458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20372542669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1273283909 + ... + 1273283924.

Almost surely, 2^20372542664 is an apocalyptic number.

It is an amenable number.

20372542664 is a deficient number, since it is larger than the sum of its proper divisors (17825974846).

20372542664 is a wasteful number, since it uses less digits than its factorization.

20372542664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546567839 (or 2546567835 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 41.

The spelling of 20372542664 in words is "twenty billion, three hundred seventy-two million, five hundred forty-two thousand, six hundred sixty-four".