20099538 has 12 divisors (see below), whose sum is σ = 43549038. Its totient is φ = 6699840.

The previous prime is 20099483. The next prime is 20099551. The reversal of 20099538 is 83599002.

It can be written as a sum of positive squares in only one way, i.e., 20007729 + 91809 = 4473^2 + 303^2 .

It is a Curzon number.

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, 558303 + ... + 558338.

Almost surely, 2^20099538 is an apocalyptic number.

20099538 is an abundant number, since it is smaller than the sum of its proper divisors (23449500).

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

20099538 is a wasteful number, since it uses less digits than its factorization.

20099538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116649 (or 1116646 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20099538 is about 4483.2508294763. The cubic root of 20099538 is about 271.8913294988.

The spelling of 20099538 in words is "twenty million, ninety-nine thousand, five hundred thirty-eight".