20357245691 has 2 divisors, whose sum is σ = 20357245692. Its totient is φ = 20357245690.

The previous prime is 20357245687. The next prime is 20357245723. The reversal of 20357245691 is 19654275302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20357245691 - 2² = 20357245687 is a prime.

It is not a weakly prime, because it can be changed into another prime (20357245621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178622845 + 10178622846.

It is an arithmetic number, because the mean of its divisors is an integer number (10178622846).

Almost surely, 2^20357245691 is an apocalyptic number.

20357245691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20357245691 is an equidigital number, since it uses as much as digits as its factorization.

20357245691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 20357245691 in words is "twenty billion, three hundred fifty-seven million, two hundred forty-five thousand, six hundred ninety-one".