20305512631 has 8 divisors (see below), whose sum is σ = 20345729184. Its totient is φ = 20265333120.

The previous prime is 20305512541. The next prime is 20305512641. The reversal of 20305512631 is 13621550302.

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 20305512631 - 2¹⁵ = 20305479863 is a prime.

It is a super-2 number, since 2×20305512631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20305512631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305512641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1252926 + ... + 1269028.

It is an arithmetic number, because the mean of its divisors is an integer number (2543216148).

Almost surely, 2^20305512631 is an apocalyptic number.

20305512631 is a deficient number, since it is larger than the sum of its proper divisors (40216553).

20305512631 is a wasteful number, since it uses less digits than its factorization.

20305512631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18521.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 20305512631 in words is "twenty billion, three hundred five million, five hundred twelve thousand, six hundred thirty-one".