20946031689 has 16 divisors (see below), whose sum is σ = 30469662720. Its totient is φ = 12693436560.

The previous prime is 20946031681. The next prime is 20946031727. The reversal of 20946031689 is 98613064902.

It is not a de Polignac number, because 20946031689 - 2³ = 20946031681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20946031681) 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, 491952 + ... + 532830.

It is an arithmetic number, because the mean of its divisors is an integer number (1904353920).

Almost surely, 2^20946031689 is an apocalyptic number.

It is an amenable number.

20946031689 is a deficient number, since it is larger than the sum of its proper divisors (9523631031).

20946031689 is a wasteful number, since it uses less digits than its factorization.

20946031689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56420.

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 20946031689 in words is "twenty billion, nine hundred forty-six million, thirty-one thousand, six hundred eighty-nine".