20405554444 has 48 divisors (see below), whose sum is σ = 41271703200. Its totient is φ = 8724546560.

The previous prime is 20405554441. The next prime is 20405554447. The reversal of 20405554444 is 44445550402.

It is an interprime number because it is at equal distance from previous prime (20405554441) and next prime (20405554447).

It is not an unprimeable number, because it can be changed into a prime (20405554441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1450854 + ... + 1464850.

It is an arithmetic number, because the mean of its divisors is an integer number (859827150).

Almost surely, 2^20405554444 is an apocalyptic number.

It is an amenable number.

20405554444 is an abundant number, since it is smaller than the sum of its proper divisors (20866148756).

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

20405554444 is a wasteful number, since it uses less digits than its factorization.

20405554444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15978 (or 15976 counting only the distinct ones).

The product of its (nonzero) digits is 256000, while the sum is 37.

The spelling of 20405554444 in words is "twenty billion, four hundred five million, five hundred fifty-four thousand, four hundred forty-four".