22117990 has 32 divisors (see below), whose sum is σ = 40979520. Its totient is φ = 8592000.

The previous prime is 22117961. The next prime is 22118011. The reversal of 22117990 is 9971122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61431 + ... + 61789.

It is an arithmetic number, because the mean of its divisors is an integer number (1280610).

Almost surely, 2^22117990 is an apocalyptic number.

22117990 is a deficient number, since it is larger than the sum of its proper divisors (18861530).

22117990 is a wasteful number, since it uses less digits than its factorization.

22117990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 22117990 is about 4702.9767169315. The cubic root of 22117990 is about 280.7039684143.

It can be divided in two parts, 2211 and 7990, that added together give a palindrome (10201).

The spelling of 22117990 in words is "twenty-two million, one hundred seventeen thousand, nine hundred ninety".