20639597040 has 100 divisors (see below), whose sum is σ = 71684400744. Its totient is φ = 5503890816.

The previous prime is 20639597003. The next prime is 20639597051. The reversal of 20639597040 is 4079593602.

It is a happy number.

20639597040 is a `hidden beast` number, since 2 + 0 + 639 + 5 + 9 + 7 + 0 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 1586082 + ... + 1599041.

Almost surely, 2^20639597040 is an apocalyptic number.

20639597040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20639597040 is an abundant number, since it is smaller than the sum of its proper divisors (51044803704).

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

20639597040 is a wasteful number, since it uses less digits than its factorization.

20639597040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185148 (or 3185133 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 20639597040 in words is "twenty billion, six hundred thirty-nine million, five hundred ninety-seven thousand, forty".