20020021000957 has 2 divisors, whose sum is σ = 20020021000958. Its totient is φ = 20020021000956.

The previous prime is 20020021000913. The next prime is 20020021000981. The reversal of 20020021000957 is 75900012002002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16095774898116 + 3924246102841 = 4011954^2 + 1980971^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020021000957 - 2²³ = 20020012612349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020021004957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010010500478 + 10010010500479.

It is an arithmetic number, because the mean of its divisors is an integer number (10010010500479).

Almost surely, 2^{20020021000957} is an apocalyptic number.

It is an amenable number.

20020021000957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020021000957 is an equidigital number, since it uses as much as digits as its factorization.

20020021000957 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 28.

Adding to 20020021000957 its reverse (75900012002002), we get a palindrome (95920033002959).

The spelling of 20020021000957 in words is "twenty trillion, twenty billion, twenty-one million, nine hundred fifty-seven", and thus it is an aban number.