20777660980 has 48 divisors (see below), whose sum is σ = 43872192000. Its totient is φ = 8265614336.

The previous prime is 20777660977. The next prime is 20777661029. The reversal of 20777660980 is 8906677702.

It is a happy number.

It is a super-2 number, since 2×20777660980² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4438281 + ... + 4442959.

It is an arithmetic number, because the mean of its divisors is an integer number (914004000).

Almost surely, 2^20777660980 is an apocalyptic number.

20777660980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20777660980 is an abundant number, since it is smaller than the sum of its proper divisors (23094531020).

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

20777660980 is a wasteful number, since it uses less digits than its factorization.

20777660980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856 (or 5854 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 20777660980 in words is "twenty billion, seven hundred seventy-seven million, six hundred sixty thousand, nine hundred eighty".