20507720211 has 60 divisors (see below), whose sum is σ = 35654234616. Its totient is φ = 11697713280.

The previous prime is 20507720209. The next prime is 20507720227. The reversal of 20507720211 is 11202770502.

It is not a de Polignac number, because 20507720211 - 2¹ = 20507720209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20507730211) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 105076 + ... + 228158.

Almost surely, 2^20507720211 is an apocalyptic number.

20507720211 is a deficient number, since it is larger than the sum of its proper divisors (15146514405).

20507720211 is a wasteful number, since it uses less digits than its factorization.

20507720211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123134 (or 123114 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The spelling of 20507720211 in words is "twenty billion, five hundred seven million, seven hundred twenty thousand, two hundred eleven".