20713499 has 4 divisors (see below), whose sum is σ = 20773200. Its totient is φ = 20653800.

The previous prime is 20713489. The next prime is 20713529. The reversal of 20713499 is 99431702.

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

It is a cyclic number.

It is not a de Polignac number, because 20713499 - 2⁸ = 20713243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20713489) 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, 29327 + ... + 30024.

It is an arithmetic number, because the mean of its divisors is an integer number (5193300).

Almost surely, 2^20713499 is an apocalyptic number.

20713499 is a deficient number, since it is larger than the sum of its proper divisors (59701).

20713499 is an equidigital number, since it uses as much as digits as its factorization.

20713499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59700.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20713499 is about 4551.2085208217. The cubic root of 20713499 is about 274.6320102756.

It can be divided in two parts, 20713 and 499, that added together give a palindrome (21212).

The spelling of 20713499 in words is "twenty million, seven hundred thirteen thousand, four hundred ninety-nine".