20860215691 has 12 divisors (see below), whose sum is σ = 25161038832. Its totient is φ = 16939120464.

The previous prime is 20860215671. The next prime is 20860215731. The reversal of 20860215691 is 19651206802.

It is not a de Polignac number, because 20860215691 - 2⁵ = 20860215659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20860215601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4124940 + ... + 4129993.

It is an arithmetic number, because the mean of its divisors is an integer number (2096753236).

Almost surely, 2^20860215691 is an apocalyptic number.

20860215691 is a deficient number, since it is larger than the sum of its proper divisors (4300823141).

20860215691 is an equidigital number, since it uses as much as digits as its factorization.

20860215691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8254978 (or 8254959 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 20860215691 in words is "twenty billion, eight hundred sixty million, two hundred fifteen thousand, six hundred ninety-one".