20516061507 has 16 divisors (see below), whose sum is σ = 27711389952. Its totient is φ = 13500208800.

The previous prime is 20516061451. The next prime is 20516061539. The reversal of 20516061507 is 70516061502.

It is not a de Polignac number, because 20516061507 - 2¹⁵ = 20516028739 is a prime.

It is a super-2 number, since 2×20516061507² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20516063507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73113 + ... + 215354.

It is an arithmetic number, because the mean of its divisors is an integer number (1731961872).

Almost surely, 2^20516061507 is an apocalyptic number.

20516061507 is a deficient number, since it is larger than the sum of its proper divisors (7195328445).

20516061507 is a wasteful number, since it uses less digits than its factorization.

20516061507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288778.

The product of its (nonzero) digits is 12600, while the sum is 33.

The spelling of 20516061507 in words is "twenty billion, five hundred sixteen million, sixty-one thousand, five hundred seven".