20740031689 has 12 divisors (see below), whose sum is σ = 23065124556. Its totient is φ = 18627216192.

The previous prime is 20740031677. The next prime is 20740031701. The reversal of 20740031689 is 98613004702.

It is an interprime number because it is at equal distance from previous prime (20740031677) and next prime (20740031701).

It can be written as a sum of positive squares in 6 ways, for example, as 3409625664 + 17330406025 = 58392^2 + 131645^2 .

It is not a de Polignac number, because 20740031689 - 2⁵ = 20740031657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20740031489) 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, 1652154 + ... + 1664659.

It is an arithmetic number, because the mean of its divisors is an integer number (1922093713).

Almost surely, 2^20740031689 is an apocalyptic number.

It is an amenable number.

20740031689 is a deficient number, since it is larger than the sum of its proper divisors (2325092867).

20740031689 is a wasteful number, since it uses less digits than its factorization.

20740031689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316876 (or 3316863 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 20740031689 in words is "twenty billion, seven hundred forty million, thirty-one thousand, six hundred eighty-nine".