20342256691 has 16 divisors (see below), whose sum is σ = 21967545600. Its totient is φ = 18774751968.

The previous prime is 20342256679. The next prime is 20342256703. The reversal of 20342256691 is 19665224302.

It is an interprime number because it is at equal distance from previous prime (20342256679) and next prime (20342256703).

It is a cyclic number.

It is not a de Polignac number, because 20342256691 - 2²⁵ = 20308702259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20342256631) 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 15 ways as a sum of consecutive naturals, for example, 285810 + ... + 349816.

It is an arithmetic number, because the mean of its divisors is an integer number (1372971600).

Almost surely, 2^20342256691 is an apocalyptic number.

20342256691 is a deficient number, since it is larger than the sum of its proper divisors (1625288909).

20342256691 is a wasteful number, since it uses less digits than its factorization.

20342256691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64458.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 20342256691 in words is "twenty billion, three hundred forty-two million, two hundred fifty-six thousand, six hundred ninety-one".