20315894466 has 64 divisors (see below), whose sum is σ = 47569471488. Its totient is φ = 5663202048.

The previous prime is 20315894441. The next prime is 20315894527. The reversal of 20315894466 is 66449851302.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1740586 + ... + 1752218.

It is an arithmetic number, because the mean of its divisors is an integer number (743272992).

Almost surely, 2^20315894466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20315894466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23784735744).

20315894466 is an abundant number, since it is smaller than the sum of its proper divisors (27253577022).

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

20315894466 is a wasteful number, since it uses less digits than its factorization.

20315894466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12655.

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 20315894466 in words is "twenty billion, three hundred fifteen million, eight hundred ninety-four thousand, four hundred sixty-six".