20391408954 has 48 divisors (see below), whose sum is σ = 52688368512. Its totient is φ = 5572806624.

The previous prime is 20391408907. The next prime is 20391409001. The reversal of 20391408954 is 45980419302.

It is an interprime number because it is at equal distance from previous prime (20391408907) and next prime (20391409001).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3515289 + ... + 3521084.

It is an arithmetic number, because the mean of its divisors is an integer number (1097674344).

Almost surely, 2^20391408954 is an apocalyptic number.

20391408954 is an abundant number, since it is smaller than the sum of its proper divisors (32296959558).

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

20391408954 is a wasteful number, since it uses less digits than its factorization.

20391408954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036411 (or 7036408 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 20391408954 in words is "twenty billion, three hundred ninety-one million, four hundred eight thousand, nine hundred fifty-four".