20807754061 has 12 divisors (see below), whose sum is σ = 22158983700. Its totient is φ = 19534822400.

The previous prime is 20807754043. The next prime is 20807754157. The reversal of 20807754061 is 16045770802.

It can be written as a sum of positive squares in 6 ways, for example, as 10199990025 + 10607764036 = 100995^2 + 102994^2 .

It is not a de Polignac number, because 20807754061 - 2¹¹ = 20807752013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20807754161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26115 + ... + 205663.

It is an arithmetic number, because the mean of its divisors is an integer number (1846581975).

Almost surely, 2^20807754061 is an apocalyptic number.

It is an amenable number.

20807754061 is a deficient number, since it is larger than the sum of its proper divisors (1351229639).

20807754061 is a wasteful number, since it uses less digits than its factorization.

20807754061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179984 (or 179967 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 20807754061 in words is "twenty billion, eight hundred seven million, seven hundred fifty-four thousand, sixty-one".