20258967497 has 4 divisors (see below), whose sum is σ = 20730106320. Its totient is φ = 19787828676.

The previous prime is 20258967451. The next prime is 20258967527. The reversal of 20258967497 is 79476985202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20258967497 - 2⁸ = 20258967241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20258967427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235569347 + ... + 235569432.

It is an arithmetic number, because the mean of its divisors is an integer number (5182526580).

Almost surely, 2^20258967497 is an apocalyptic number.

It is an amenable number.

20258967497 is a deficient number, since it is larger than the sum of its proper divisors (471138823).

20258967497 is an equidigital number, since it uses as much as digits as its factorization.

20258967497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471138822.

The product of its (nonzero) digits is 15240960, while the sum is 59.

Adding to 20258967497 its sum of digits (59), we get a square (20258967556 = 142334²).

The spelling of 20258967497 in words is "twenty billion, two hundred fifty-eight million, nine hundred sixty-seven thousand, four hundred ninety-seven".