20171954674 has 4 divisors (see below), whose sum is σ = 30257932014. Its totient is φ = 10085977336.

The previous prime is 20171954659. The next prime is 20171954723. The reversal of 20171954674 is 47645917102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14267108025 + 5904846649 = 119445^2 + 76843^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5042988667 + ... + 5042988670.

Almost surely, 2^20171954674 is an apocalyptic number.

20171954674 is a deficient number, since it is larger than the sum of its proper divisors (10085977340).

20171954674 is a wasteful number, since it uses less digits than its factorization.

20171954674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10085977339.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 20171954674 in words is "twenty billion, one hundred seventy-one million, nine hundred fifty-four thousand, six hundred seventy-four".