20612320451 has 2 divisors, whose sum is σ = 20612320452. Its totient is φ = 20612320450.

The previous prime is 20612320439. The next prime is 20612320499. The reversal of 20612320451 is 15402321602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20612320451 - 2³⁰ = 19538578627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20612320451.

It is not a weakly prime, because it can be changed into another prime (20612320951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306160225 + 10306160226.

It is an arithmetic number, because the mean of its divisors is an integer number (10306160226).

Almost surely, 2^20612320451 is an apocalyptic number.

20612320451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20612320451 is an equidigital number, since it uses as much as digits as its factorization.

20612320451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 20612320451 in words is "twenty billion, six hundred twelve million, three hundred twenty thousand, four hundred fifty-one".