20749632560 has 40 divisors (see below), whose sum is σ = 49546764816. Its totient is φ = 8075531520.

The previous prime is 20749632539. The next prime is 20749632593. The reversal of 20749632560 is 6523694702.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3502046 + ... + 3507965.

Almost surely, 2^20749632560 is an apocalyptic number.

20749632560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20749632560 is an abundant number, since it is smaller than the sum of its proper divisors (28797132256).

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

20749632560 is a wasteful number, since it uses less digits than its factorization.

20749632560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010061 (or 7010055 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 20749632560 in words is "twenty billion, seven hundred forty-nine million, six hundred thirty-two thousand, five hundred sixty".