20221508 has 12 divisors (see below), whose sum is σ = 36926400. Its totient is φ = 9671112.

The previous prime is 20221489. The next prime is 20221541. The reversal of 20221508 is 80512202.

It is a self number, because there is not a number n which added to its sum of digits gives 20221508.

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, 109808 + ... + 109991.

It is an arithmetic number, because the mean of its divisors is an integer number (3077200).

Almost surely, 2^20221508 is an apocalyptic number.

It is an amenable number.

20221508 is a deficient number, since it is larger than the sum of its proper divisors (16704892).

20221508 is a wasteful number, since it uses less digits than its factorization.

20221508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219826 (or 219824 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20221508 is about 4496.8331078660. The cubic root of 20221508 is about 272.4401933671.

The spelling of 20221508 in words is "twenty million, two hundred twenty-one thousand, five hundred eight".