20910222 has 24 divisors (see below), whose sum is σ = 47690760. Its totient is φ = 6603120.

The previous prime is 20910179. The next prime is 20910257. The reversal of 20910222 is 22201902.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20910195 and 20910204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30229 + ... + 30912.

It is an arithmetic number, because the mean of its divisors is an integer number (1987115).

Almost surely, 2^20910222 is an apocalyptic number.

20910222 is an abundant number, since it is smaller than the sum of its proper divisors (26780538).

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

20910222 is a wasteful number, since it uses less digits than its factorization.

20910222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61168 (or 61165 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20910222 is about 4572.7696202630. The cubic root of 20910222 is about 275.4986961993.

The spelling of 20910222 in words is "twenty million, nine hundred ten thousand, two hundred twenty-two".