20915226 has 32 divisors (see below), whose sum is σ = 46793280. Its totient is φ = 6924528.

The previous prime is 20915203. The next prime is 20915227. The reversal of 20915226 is 62251902.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20915226.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20915227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7245 + ... + 9711.

It is an arithmetic number, because the mean of its divisors is an integer number (1462290).

Almost surely, 2^20915226 is an apocalyptic number.

20915226 is an abundant number, since it is smaller than the sum of its proper divisors (25878054).

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

20915226 is a wasteful number, since it uses less digits than its factorization.

20915226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635 (or 2629 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20915226 is about 4573.3167395229. The cubic root of 20915226 is about 275.5206708667.

The spelling of 20915226 in words is "twenty million, nine hundred fifteen thousand, two hundred twenty-six".