20780510721675 has 12 divisors (see below), whose sum is σ = 34357111059960. Its totient is φ = 11082939051520.

The previous prime is 20780510721623. The next prime is 20780510721697. The reversal of 20780510721675 is 57612701508702.

It is not a de Polignac number, because 20780510721675 - 2¹¹ = 20780510719627 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138536738070 + ... + 138536738219.

It is an arithmetic number, because the mean of its divisors is an integer number (2863092588330).

Almost surely, 2^{20780510721675} is an apocalyptic number.

20780510721675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20780510721675 is a deficient number, since it is larger than the sum of its proper divisors (13576600338285).

20780510721675 is a wasteful number, since it uses less digits than its factorization.

20780510721675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277073476302 (or 277073476297 counting only the distinct ones).

The product of its (nonzero) digits is 1646400, while the sum is 51.

The spelling of 20780510721675 in words is "twenty trillion, seven hundred eighty billion, five hundred ten million, seven hundred twenty-one thousand, six hundred seventy-five".