20712999 has 4 divisors (see below), whose sum is σ = 27617336. Its totient is φ = 13808664.

The previous prime is 20712997. The next prime is 20713003. The reversal of 20712999 is 99921702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20712999 - 2¹ = 20712997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712997) 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, 3452164 + ... + 3452169.

It is an arithmetic number, because the mean of its divisors is an integer number (6904334).

Almost surely, 2^20712999 is an apocalyptic number.

20712999 is a deficient number, since it is larger than the sum of its proper divisors (6904337).

20712999 is an equidigital number, since it uses as much as digits as its factorization.

20712999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904336.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 20712999 is about 4551.1535900253. The cubic root of 20712999 is about 274.6298004910.

The spelling of 20712999 in words is "twenty million, seven hundred twelve thousand, nine hundred ninety-nine".