20440008 has 48 divisors (see below), whose sum is σ = 57769920. Its totient is φ = 6516576.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440008 is 80004402.

It is a happy number.

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

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, 4516 + ... + 7827.

It is an arithmetic number, because the mean of its divisors is an integer number (1203540).

Almost surely, 2^20440008 is an apocalyptic number.

It is an amenable number.

20440008 is an abundant number, since it is smaller than the sum of its proper divisors (37329912).

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

20440008 is a wasteful number, since it uses less digits than its factorization.

20440008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12378 (or 12371 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 20440008 is about 4521.0627069307. The cubic root of 20440008 is about 273.4179485536.

The spelling of 20440008 in words is "twenty million, four hundred forty thousand, eight".