20549801900 has 18 divisors (see below), whose sum is σ = 44593070340. Its totient is φ = 8219920720.

The previous prime is 20549801891. The next prime is 20549801933. The reversal of 20549801900 is 910894502.

It is a super-2 number, since 2×20549801900² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102748910 + ... + 102749109.

Almost surely, 2^20549801900 is an apocalyptic number.

20549801900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20549801900 is an abundant number, since it is smaller than the sum of its proper divisors (24043268440).

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

20549801900 is a wasteful number, since it uses less digits than its factorization.

20549801900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205498033 (or 205498026 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 20549801900 in words is "twenty billion, five hundred forty-nine million, eight hundred one thousand, nine hundred".