20313497 has 4 divisors (see below), whose sum is σ = 20325120. Its totient is φ = 20301876.

The previous prime is 20313493. The next prime is 20313509. The reversal of 20313497 is 79431302.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20313497 - 2² = 20313493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20313493) 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, 2597 + ... + 6882.

It is an arithmetic number, because the mean of its divisors is an integer number (5081280).

Almost surely, 2^20313497 is an apocalyptic number.

It is an amenable number.

20313497 is a deficient number, since it is larger than the sum of its proper divisors (11623).

20313497 is an equidigital number, since it uses as much as digits as its factorization.

20313497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11622.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20313497 is about 4507.0497001919. The cubic root of 20313497 is about 272.8526847690.

Adding to 20313497 its reverse (79431302), we get a palindrome (99744799).

The spelling of 20313497 in words is "twenty million, three hundred thirteen thousand, four hundred ninety-seven".