20347871751 has 6 divisors (see below), whose sum is σ = 29391370320. Its totient is φ = 13565247828.

The previous prime is 20347871749. The next prime is 20347871773. The reversal of 20347871751 is 15717874302.

20347871751 is a `hidden beast` number, since 2 + 0 + 3 + 478 + 7 + 175 + 1 = 666.

It is not a de Polignac number, because 20347871751 - 2¹ = 20347871749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20347871697 and 20347871706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20347871711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1130437311 + ... + 1130437328.

It is an arithmetic number, because the mean of its divisors is an integer number (4898561720).

Almost surely, 2^20347871751 is an apocalyptic number.

20347871751 is a deficient number, since it is larger than the sum of its proper divisors (9043498569).

20347871751 is a wasteful number, since it uses less digits than its factorization.

20347871751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260874645 (or 2260874642 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 20347871751 in words is "twenty billion, three hundred forty-seven million, eight hundred seventy-one thousand, seven hundred fifty-one".