20822989464 has 160 divisors (see below), whose sum is σ = 60970583520. Its totient is φ = 6627101184.

The previous prime is 20822989423. The next prime is 20822989471. The reversal of 20822989464 is 46498922802.

20822989464 is a `hidden beast` number, since 2 + 0 + 82 + 29 + 89 + 464 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 20822989464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11877612 + ... + 11879364.

It is an arithmetic number, because the mean of its divisors is an integer number (381066147).

Almost surely, 2^20822989464 is an apocalyptic number.

20822989464 is a gapful number since it is divisible by the number (24) 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 20822989464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30485291760).

20822989464 is an abundant number, since it is smaller than the sum of its proper divisors (40147594056).

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

20822989464 is a wasteful number, since it uses less digits than its factorization.

20822989464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591 (or 2578 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 20822989464 in words is "twenty billion, eight hundred twenty-two million, nine hundred eighty-nine thousand, four hundred sixty-four".