22031916 has 12 divisors (see below), whose sum is σ = 51407832. Its totient is φ = 7343968.

The previous prime is 22031899. The next prime is 22031921. The reversal of 22031916 is 61913022.

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

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, 917985 + ... + 918008.

It is an arithmetic number, because the mean of its divisors is an integer number (4283986).

Almost surely, 2^22031916 is an apocalyptic number.

It is an amenable number.

22031916 is an abundant number, since it is smaller than the sum of its proper divisors (29375916).

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

22031916 is a wasteful number, since it uses less digits than its factorization.

22031916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836000 (or 1835998 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 22031916 is about 4693.8167838125. The cubic root of 22031916 is about 280.3393674231.

Adding to 22031916 its reverse (61913022), we get a palindrome (83944938).

The spelling of 22031916 in words is "twenty-two million, thirty-one thousand, nine hundred sixteen".