20321510977980 has 120 divisors (see below), whose sum is σ = 63984571358400. Its totient is φ = 5399072910720.

The previous prime is 20321510977967. The next prime is 20321510977981. The reversal of 20321510977980 is 8977901512302.

It is a happy number.

20321510977980 is a `hidden beast` number, since 2 + 0 + 32 + 1 + 510 + 9 + 7 + 7 + 98 + 0 = 666.

20321510977980 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321510977981) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22705155 + ... + 23583194.

It is an arithmetic number, because the mean of its divisors is an integer number (533204761320).

Almost surely, 2^{20321510977980} is an apocalyptic number.

20321510977980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321510977980 is an abundant number, since it is smaller than the sum of its proper divisors (43663060380420).

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

20321510977980 is a wasteful number, since it uses less digits than its factorization.

20321510977980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46288641 (or 46288630 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 20321510977980 in words is "twenty trillion, three hundred twenty-one billion, five hundred ten million, nine hundred seventy-seven thousand, nine hundred eighty".