20921196 has 12 divisors (see below), whose sum is σ = 48816152. Its totient is φ = 6973728.

The previous prime is 20921161. The next prime is 20921221. The reversal of 20921196 is 69112902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871705 + ... + 871728.

Almost surely, 2^20921196 is an apocalyptic number.

It is an amenable number.

20921196 is an abundant number, since it is smaller than the sum of its proper divisors (27894956).

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

20921196 is a wasteful number, since it uses less digits than its factorization.

20921196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743440 (or 1743438 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 20921196 is about 4573.9693921145. The cubic root of 20921196 is about 275.5468830614.

The spelling of 20921196 in words is "twenty million, nine hundred twenty-one thousand, one hundred ninety-six".