20639381466 has 16 divisors (see below), whose sum is σ = 45031377888. Its totient is φ = 6254358000.

The previous prime is 20639381431. The next prime is 20639381491. The reversal of 20639381466 is 66418393602.

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, 156358885 + ... + 156359016.

It is an arithmetic number, because the mean of its divisors is an integer number (2814461118).

Almost surely, 2^20639381466 is an apocalyptic number.

20639381466 is an abundant number, since it is smaller than the sum of its proper divisors (24391996422).

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

20639381466 is a wasteful number, since it uses less digits than its factorization.

20639381466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312717917.

The product of its (nonzero) digits is 1119744, while the sum is 48.

The spelling of 20639381466 in words is "twenty billion, six hundred thirty-nine million, three hundred eighty-one thousand, four hundred sixty-six".