20646426480 has 160 divisors (see below), whose sum is σ = 65614639680. Its totient is φ = 5368872960.

The previous prime is 20646426439. The next prime is 20646426481. The reversal of 20646426480 is 8462464602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646426481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1552660 + ... + 1565900.

It is an arithmetic number, because the mean of its divisors is an integer number (410091498).

Almost surely, 2^20646426480 is an apocalyptic number.

20646426480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20646426480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32807319840).

20646426480 is an abundant number, since it is smaller than the sum of its proper divisors (44968213200).

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

20646426480 is a wasteful number, since it uses less digits than its factorization.

20646426480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13419 (or 13413 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 42.

The spelling of 20646426480 in words is "twenty billion, six hundred forty-six million, four hundred twenty-six thousand, four hundred eighty".