20899212 has 24 divisors (see below), whose sum is σ = 49079856. Its totient is φ = 6921408.

The previous prime is 20899211. The next prime is 20899231. The reversal of 20899212 is 21299802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20899211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3663 + ... + 7430.

It is an arithmetic number, because the mean of its divisors is an integer number (2044994).

Almost surely, 2^20899212 is an apocalyptic number.

It is an amenable number.

20899212 is an abundant number, since it is smaller than the sum of its proper divisors (28180644).

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

20899212 is a wasteful number, since it uses less digits than its factorization.

20899212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11257 (or 11255 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20899212 is about 4571.5655961607. The cubic root of 20899212 is about 275.4503343156.

The spelling of 20899212 in words is "twenty million, eight hundred ninety-nine thousand, two hundred twelve".