20507366516 has 108 divisors (see below), whose sum is σ = 45381233772. Its totient is φ = 8081289216.

The previous prime is 20507366491. The next prime is 20507366527. The reversal of 20507366516 is 61566370502.

It can be written as a sum of positive squares in 6 ways, for example, as 4581936100 + 15925430416 = 67690^2 + 126196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9704276 + ... + 9706388.

It is an arithmetic number, because the mean of its divisors is an integer number (420196609).

Almost surely, 2^20507366516 is an apocalyptic number.

20507366516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20507366516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22690616886).

20507366516 is an abundant number, since it is smaller than the sum of its proper divisors (24873867256).

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

20507366516 is a wasteful number, since it uses less digits than its factorization.

20507366516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450 (or 2428 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 20507366516 in words is "twenty billion, five hundred seven million, three hundred sixty-six thousand, five hundred sixteen".