20264545997 has 2 divisors, whose sum is σ = 20264545998. Its totient is φ = 20264545996.

The previous prime is 20264545949. The next prime is 20264545999. The reversal of 20264545997 is 79954546202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14666663236 + 5597882761 = 121106^2 + 74819^2 .

It is a cyclic number.

It is not a de Polignac number, because 20264545997 - 2¹² = 20264541901 is a prime.

Together with 20264545999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20264545999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10132272998 + 10132272999.

It is an arithmetic number, because the mean of its divisors is an integer number (10132272999).

Almost surely, 2^20264545997 is an apocalyptic number.

It is an amenable number.

20264545997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20264545997 is an equidigital number, since it uses as much as digits as its factorization.

20264545997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 20264545997 in words is "twenty billion, two hundred sixty-four million, five hundred forty-five thousand, nine hundred ninety-seven".