20654457413 has 2 divisors, whose sum is σ = 20654457414. Its totient is φ = 20654457412.

The previous prime is 20654457409. The next prime is 20654457419. The reversal of 20654457413 is 31475445602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15371784289 + 5282673124 = 123983^2 + 72682^2 .

It is a cyclic number.

It is not a de Polignac number, because 20654457413 - 2² = 20654457409 is a prime.

It is a super-2 number, since 2×20654457413² (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 (20654457419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327228706 + 10327228707.

It is an arithmetic number, because the mean of its divisors is an integer number (10327228707).

Almost surely, 2^20654457413 is an apocalyptic number.

It is an amenable number.

20654457413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20654457413 is an equidigital number, since it uses as much as digits as its factorization.

20654457413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20654457413 in words is "twenty billion, six hundred fifty-four million, four hundred fifty-seven thousand, four hundred thirteen".