20631479285 has 8 divisors (see below), whose sum is σ = 24758559960. Its totient is φ = 16504660224.

The previous prime is 20631479279. The next prime is 20631479303. The reversal of 20631479285 is 58297413602.

It can be written as a sum of positive squares in 4 ways, for example, as 3495883876 + 17135595409 = 59126^2 + 130903^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20631479285 - 2¹⁸ = 20631217141 is a prime.

It is a super-2 number, since 2×20631479285² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226721 + ... + 304409.

It is an arithmetic number, because the mean of its divisors is an integer number (3094819995).

It is a 1-persistent number, because it is pandigital, but 2⋅20631479285 = 41262958570 is not.

Almost surely, 2^20631479285 is an apocalyptic number.

It is an amenable number.

20631479285 is a deficient number, since it is larger than the sum of its proper divisors (4127080675).

20631479285 is an equidigital number, since it uses as much as digits as its factorization.

20631479285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130807.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20631479285 in words is "twenty billion, six hundred thirty-one million, four hundred seventy-nine thousand, two hundred eighty-five".