20472208557 has 8 divisors (see below), whose sum is σ = 27330022080. Its totient is φ = 13631267040.

The previous prime is 20472208487. The next prime is 20472208573. The reversal of 20472208557 is 75580227402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20472208557 - 2⁷ = 20472208429 is a prime.

It is a super-2 number, since 2×20472208557² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472200557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4215169 + ... + 4220022.

It is an arithmetic number, because the mean of its divisors is an integer number (3416252760).

Almost surely, 2^20472208557 is an apocalyptic number.

It is an amenable number.

20472208557 is a deficient number, since it is larger than the sum of its proper divisors (6857813523).

20472208557 is an equidigital number, since it uses as much as digits as its factorization.

20472208557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8436003.

The product of its (nonzero) digits is 313600, while the sum is 42.

The spelling of 20472208557 in words is "twenty billion, four hundred seventy-two million, two hundred eight thousand, five hundred fifty-seven".