20451286916 has 24 divisors (see below), whose sum is σ = 36669472224. Its totient is φ = 9974387520.

The previous prime is 20451286913. The next prime is 20451286969. The reversal of 20451286916 is 61968215402.

It is not an unprimeable number, because it can be changed into a prime (20451286913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1397051 + ... + 1411613.

It is an arithmetic number, because the mean of its divisors is an integer number (1527894676).

Almost surely, 2^20451286916 is an apocalyptic number.

It is an amenable number.

20451286916 is a deficient number, since it is larger than the sum of its proper divisors (16218185308).

20451286916 is a wasteful number, since it uses less digits than its factorization.

20451286916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23171 (or 23169 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 20451286916 in words is "twenty billion, four hundred fifty-one million, two hundred eighty-six thousand, nine hundred sixteen".