20215320780 has 48 divisors (see below), whose sum is σ = 56638391040. Its totient is φ = 5387371968.

The previous prime is 20215320773. The next prime is 20215320821. The reversal of 20215320780 is 8702351202.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 8410 + ... + 201249.

It is an arithmetic number, because the mean of its divisors is an integer number (1179966480).

Almost surely, 2^20215320780 is an apocalyptic number.

20215320780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20215320780 is an abundant number, since it is smaller than the sum of its proper divisors (36423070260).

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

20215320780 is a wasteful number, since it uses less digits than its factorization.

20215320780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211278 (or 211276 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

Adding to 20215320780 its reverse (8702351202), we get a palindrome (28917671982).

The spelling of 20215320780 in words is "twenty billion, two hundred fifteen million, three hundred twenty thousand, seven hundred eighty".