20355864407 has 2 divisors, whose sum is σ = 20355864408. Its totient is φ = 20355864406.

The previous prime is 20355864337. The next prime is 20355864433. The reversal of 20355864407 is 70446855302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20355864407 - 2³⁴ = 3175995223 is a prime.

It is a super-2 number, since 2×20355864407² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20355864467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177932203 + 10177932204.

It is an arithmetic number, because the mean of its divisors is an integer number (10177932204).

Almost surely, 2^20355864407 is an apocalyptic number.

20355864407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355864407 is an equidigital number, since it uses as much as digits as its factorization.

20355864407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 20355864407 in words is "twenty billion, three hundred fifty-five million, eight hundred sixty-four thousand, four hundred seven".