20200020011957 has 2 divisors, whose sum is σ = 20200020011958. Its totient is φ = 20200020011956.

The previous prime is 20200020011953. The next prime is 20200020011971. The reversal of 20200020011957 is 75911002000202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16883108516836 + 3316911495121 = 4108906^2 + 1821239^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200020011957 - 2² = 20200020011953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200020011953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100010005978 + 10100010005979.

It is an arithmetic number, because the mean of its divisors is an integer number (10100010005979).

Almost surely, 2^{20200020011957} is an apocalyptic number.

It is an amenable number.

20200020011957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200020011957 is an equidigital number, since it uses as much as digits as its factorization.

20200020011957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The spelling of 20200020011957 in words is "twenty trillion, two hundred billion, twenty million, eleven thousand, nine hundred fifty-seven".