20499585040 has 40 divisors (see below), whose sum is σ = 51994404288. Its totient is φ = 7454394240.

The previous prime is 20499585023. The next prime is 20499585053. The reversal of 20499585040 is 4058599402.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11646612 + ... + 11648371.

Almost surely, 2^20499585040 is an apocalyptic number.

20499585040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20499585040 is an abundant number, since it is smaller than the sum of its proper divisors (31494819248).

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

20499585040 is a wasteful number, since it uses less digits than its factorization.

20499585040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23295007 (or 23295001 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 20499585040 in words is "twenty billion, four hundred ninety-nine million, five hundred eighty-five thousand, forty".