20812497 has 8 divisors (see below), whose sum is σ = 27813600. Its totient is φ = 13843200.

The previous prime is 20812483. The next prime is 20812511. The reversal of 20812497 is 79421802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20812483) and next prime (20812511).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20812497 - 2⁶ = 20812433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20812397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6379 + ... + 9072.

It is an arithmetic number, because the mean of its divisors is an integer number (3476700).

Almost surely, 2^20812497 is an apocalyptic number.

It is an amenable number.

20812497 is a deficient number, since it is larger than the sum of its proper divisors (7001103).

20812497 is a wasteful number, since it uses less digits than its factorization.

20812497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15903.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20812497 is about 4562.0715689257. The cubic root of 20812497 is about 275.0688400663.

The spelling of 20812497 in words is "twenty million, eight hundred twelve thousand, four hundred ninety-seven".