20899912 has 32 divisors (see below), whose sum is σ = 42926400. Its totient is φ = 9460800.

The previous prime is 20899909. The next prime is 20899933. The reversal of 20899912 is 21999802.

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, 38362 + ... + 38902.

It is an arithmetic number, because the mean of its divisors is an integer number (1341450).

Almost surely, 2^20899912 is an apocalyptic number.

20899912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20899912 is an abundant number, since it is smaller than the sum of its proper divisors (22026488).

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

20899912 is a wasteful number, since it uses less digits than its factorization.

20899912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 20899912 is about 4571.6421557248. The cubic root of 20899912 is about 275.4534096003.

The spelling of 20899912 in words is "twenty million, eight hundred ninety-nine thousand, nine hundred twelve".