20712499 has 2 divisors, whose sum is σ = 20712500. Its totient is φ = 20712498.

The previous prime is 20712493. The next prime is 20712521. The reversal of 20712499 is 99421702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20712499 - 2³ = 20712491 is a prime.

It is a super-2 number, since 2×20712499² = 858015229650002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20712491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356249 + 10356250.

It is an arithmetic number, because the mean of its divisors is an integer number (10356250).

Almost surely, 2^20712499 is an apocalyptic number.

20712499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712499 is an equidigital number, since it uses as much as digits as its factorization.

20712499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20712499 is about 4551.0986585659. The cubic root of 20712499 is about 274.6275906709.

The spelling of 20712499 in words is "twenty million, seven hundred twelve thousand, four hundred ninety-nine".