20631100861 has 8 divisors (see below), whose sum is σ = 23639016960. Its totient is φ = 17638338768.

The previous prime is 20631100843. The next prime is 20631100879. The reversal of 20631100861 is 16800113602.

It is an interprime number because it is at equal distance from previous prime (20631100843) and next prime (20631100879).

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 20631100861 - 2²¹ = 20629003709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631100891) 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, 3785581 + ... + 3791026.

It is an arithmetic number, because the mean of its divisors is an integer number (2954877120).

Almost surely, 2^20631100861 is an apocalyptic number.

It is an amenable number.

20631100861 is a deficient number, since it is larger than the sum of its proper divisors (3007916099).

20631100861 is an equidigital number, since it uses as much as digits as its factorization.

20631100861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7577003.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 20631100861 in words is "twenty billion, six hundred thirty-one million, one hundred thousand, eight hundred sixty-one".