20345912847 has 24 divisors (see below), whose sum is σ = 32121586224. Its totient is φ = 12333682944.

The previous prime is 20345912843. The next prime is 20345912903. The reversal of 20345912847 is 74821954302.

20345912847 is a `hidden beast` number, since 2 + 0 + 34 + 591 + 28 + 4 + 7 = 666.

It is not a de Polignac number, because 20345912847 - 2² = 20345912843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345912843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1289898 + ... + 1305575.

It is an arithmetic number, because the mean of its divisors is an integer number (1338399426).

Almost surely, 2^20345912847 is an apocalyptic number.

20345912847 is a deficient number, since it is larger than the sum of its proper divisors (11775673377).

20345912847 is a wasteful number, since it uses less digits than its factorization.

20345912847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595559 (or 2595556 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20345912847 in words is "twenty billion, three hundred forty-five million, nine hundred twelve thousand, eight hundred forty-seven".