20802765620 has 96 divisors (see below), whose sum is σ = 53801454336. Its totient is φ = 6579532800.

The previous prime is 20802765617. The next prime is 20802765631. The reversal of 20802765620 is 2656720802.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 4148915 + ... + 4153925.

It is an arithmetic number, because the mean of its divisors is an integer number (560431816).

Almost surely, 2^20802765620 is an apocalyptic number.

20802765620 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 20802765620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26900727168).

20802765620 is an abundant number, since it is smaller than the sum of its proper divisors (32998688716).

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

20802765620 is a wasteful number, since it uses less digits than its factorization.

20802765620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7321 (or 7319 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 20802765620 in words is "twenty billion, eight hundred two million, seven hundred sixty-five thousand, six hundred twenty".