20440400408 has 16 divisors (see below), whose sum is σ = 38392181880. Its totient is φ = 10202485248.

The previous prime is 20440400377. The next prime is 20440400417. The reversal of 20440400408 is 80400404402.

It is a congruent number.

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, 2209466 + ... + 2218697.

Almost surely, 2^20440400408 is an apocalyptic number.

It is an amenable number.

20440400408 is a deficient number, since it is larger than the sum of its proper divisors (17951781472).

20440400408 is a wasteful number, since it uses less digits than its factorization.

20440400408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428746 (or 4428742 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The spelling of 20440400408 in words is "twenty billion, four hundred forty million, four hundred thousand, four hundred eight".