20442664 has 16 divisors (see below), whose sum is σ = 41814720. Its totient is φ = 9292080.

The previous prime is 20442661. The next prime is 20442691. The reversal of 20442664 is 46624402.

It is a super-2 number, since 2×20442664² = 835805022833792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20442661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116064 + ... + 116239.

It is an arithmetic number, because the mean of its divisors is an integer number (2613420).

Almost surely, 2^20442664 is an apocalyptic number.

It is an amenable number.

20442664 is an abundant number, since it is smaller than the sum of its proper divisors (21372056).

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

20442664 is a wasteful number, since it uses less digits than its factorization.

20442664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232320 (or 232316 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 20442664 is about 4521.3564336380. The cubic root of 20442664 is about 273.4297907965.

The spelling of 20442664 in words is "twenty million, four hundred forty-two thousand, six hundred sixty-four".