20899404 has 24 divisors (see below), whose sum is σ = 54183920. Its totient is φ = 6966432.

The previous prime is 20899379. The next prime is 20899423. The reversal of 20899404 is 40499802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 96649 + ... + 96864.

Almost surely, 2^20899404 is an apocalyptic number.

It is an amenable number.

20899404 is an abundant number, since it is smaller than the sum of its proper divisors (33284516).

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

20899404 is a wasteful number, since it uses less digits than its factorization.

20899404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193526 (or 193518 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20899404 is about 4571.5865954830. The cubic root of 20899404 is about 275.4511778291.

The spelling of 20899404 in words is "twenty million, eight hundred ninety-nine thousand, four hundred four".