20653797920 has 144 divisors (see below), whose sum is σ = 57481280640. Its totient is φ = 6991455744.

The previous prime is 20653797919. The next prime is 20653797959. The reversal of 20653797920 is 2979735602.

It is a happy number.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 602687 + ... + 636033.

It is an arithmetic number, because the mean of its divisors is an integer number (399175560).

Almost surely, 2^20653797920 is an apocalyptic number.

20653797920 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 20653797920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28740640320).

20653797920 is an abundant number, since it is smaller than the sum of its proper divisors (36827482720).

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

20653797920 is a wasteful number, since it uses less digits than its factorization.

20653797920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33455 (or 33440 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 50.

The spelling of 20653797920 in words is "twenty billion, six hundred fifty-three million, seven hundred ninety-seven thousand, nine hundred twenty".