20401023457 has 2 divisors, whose sum is σ = 20401023458. Its totient is φ = 20401023456.

The previous prime is 20401023421. The next prime is 20401023521. The reversal of 20401023457 is 75432010402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16859464336 + 3541559121 = 129844^2 + 59511^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401023457 - 2¹⁵ = 20400990689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20401020457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200511728 + 10200511729.

It is an arithmetic number, because the mean of its divisors is an integer number (10200511729).

Almost surely, 2^20401023457 is an apocalyptic number.

It is an amenable number.

20401023457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401023457 is an equidigital number, since it uses as much as digits as its factorization.

20401023457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

Adding to 20401023457 its reverse (75432010402), we get a palindrome (95833033859).

The spelling of 20401023457 in words is "twenty billion, four hundred one million, twenty-three thousand, four hundred fifty-seven".