20461365997 has 2 divisors, whose sum is σ = 20461365998. Its totient is φ = 20461365996.

The previous prime is 20461365989. The next prime is 20461366031. The reversal of 20461365997 is 79956316402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16565234436 + 3896131561 = 128706^2 + 62419^2 .

It is a cyclic number.

It is not a de Polignac number, because 20461365997 - 2³ = 20461365989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20461366997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10230682998 + 10230682999.

It is an arithmetic number, because the mean of its divisors is an integer number (10230682999).

Almost surely, 2^20461365997 is an apocalyptic number.

It is an amenable number.

20461365997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20461365997 is an equidigital number, since it uses as much as digits as its factorization.

20461365997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 20461365997 in words is "twenty billion, four hundred sixty-one million, three hundred sixty-five thousand, nine hundred ninety-seven".