20980621955 has 8 divisors (see below), whose sum is σ = 25177526304. Its totient is φ = 16783977600.

The previous prime is 20980621951. The next prime is 20980621957. The reversal of 20980621955 is 55912608902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20980621955 - 2² = 20980621951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20980621951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263195 + ... + 333515.

It is an arithmetic number, because the mean of its divisors is an integer number (3147190788).

Almost surely, 2^20980621955 is an apocalyptic number.

20980621955 is a deficient number, since it is larger than the sum of its proper divisors (4196904349).

20980621955 is an equidigital number, since it uses as much as digits as its factorization.

20980621955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129997.

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 20980621955 in words is "twenty billion, nine hundred eighty million, six hundred twenty-one thousand, nine hundred fifty-five".