20047856359491 has 6 divisors (see below), whose sum is σ = 28958014741500. Its totient is φ = 13365237572988.

The previous prime is 20047856359483. The next prime is 20047856359511. The reversal of 20047856359491 is 19495365874002.

20047856359491 is a `hidden beast` number, since 2 + 0 + 0 + 4 + 7 + 85 + 63 + 5 + 9 + 491 = 666.

It is not a de Polignac number, because 20047856359491 - 2³ = 20047856359483 is a prime.

It is a super-2 number, since 2×20047856359491² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20047856359441) 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, 1113769797741 + ... + 1113769797758.

It is an arithmetic number, because the mean of its divisors is an integer number (4826335790250).

It is a 1-persistent number, because it is pandigital, but 2⋅20047856359491 = 40095712718982 is not.

Almost surely, 2^{20047856359491} is an apocalyptic number.

20047856359491 is a deficient number, since it is larger than the sum of its proper divisors (8910158382009).

20047856359491 is a wasteful number, since it uses less digits than its factorization.

20047856359491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227539595505 (or 2227539595502 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 63.

The spelling of 20047856359491 in words is "twenty trillion, forty-seven billion, eight hundred fifty-six million, three hundred fifty-nine thousand, four hundred ninety-one".