20404524457 has 2 divisors, whose sum is σ = 20404524458. Its totient is φ = 20404524456.

The previous prime is 20404524341. The next prime is 20404524473. The reversal of 20404524457 is 75442540402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19427899456 + 976625001 = 139384^2 + 31251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20404524457 is a prime.

It is a super-2 number, since 2×20404524457² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20404524157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202262228 + 10202262229.

It is an arithmetic number, because the mean of its divisors is an integer number (10202262229).

Almost surely, 2^20404524457 is an apocalyptic number.

It is an amenable number.

20404524457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404524457 is an equidigital number, since it uses as much as digits as its factorization.

20404524457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 179200, while the sum is 37.

The spelling of 20404524457 in words is "twenty billion, four hundred four million, five hundred twenty-four thousand, four hundred fifty-seven".