20421515874 has 8 divisors (see below), whose sum is σ = 40843031760. Its totient is φ = 6807171956.

The previous prime is 20421515867. The next prime is 20421515911. The reversal of 20421515874 is 47851512402.

It is a sphenic number, since it is the product of 3 distinct primes.

20421515874 is an admirable 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, 1701792984 + ... + 1701792995.

It is an arithmetic number, because the mean of its divisors is an integer number (5105378970).

Almost surely, 2^20421515874 is an apocalyptic number.

20421515874 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20421515874 is a wasteful number, since it uses less digits than its factorization.

20421515874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3403585984.

The product of its (nonzero) digits is 89600, while the sum is 39.

The spelling of 20421515874 in words is "twenty billion, four hundred twenty-one million, five hundred fifteen thousand, eight hundred seventy-four".