20454071808 has 80 divisors (see below), whose sum is σ = 56248828416. Its totient is φ = 6598072320.

The previous prime is 20454071783. The next prime is 20454071821. The reversal of 20454071808 is 80817045402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167166 + ... + 262397.

Almost surely, 2^20454071808 is an apocalyptic number.

It is an amenable number.

20454071808 is an abundant number, since it is smaller than the sum of its proper divisors (35794756608).

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

20454071808 is an equidigital number, since it uses as much as digits as its factorization.

20454071808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429615 (or 429599 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 39.

The spelling of 20454071808 in words is "twenty billion, four hundred fifty-four million, seventy-one thousand, eight hundred eight".