20724659 has 2 divisors, whose sum is σ = 20724660. Its totient is φ = 20724658.

The previous prime is 20724653. The next prime is 20724673. The reversal of 20724659 is 95642702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20724659 is a prime.

It is a super-2 number, since 2×20724659² = 859022981332562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20724653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362329 + 10362330.

It is an arithmetic number, because the mean of its divisors is an integer number (10362330).

Almost surely, 2^20724659 is an apocalyptic number.

20724659 is a deficient number, since it is larger than the sum of its proper divisors (1).

20724659 is an equidigital number, since it uses as much as digits as its factorization.

20724659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20724659 is about 4552.4344037009. The cubic root of 20724659 is about 274.6813234146.

The spelling of 20724659 in words is "twenty million, seven hundred twenty-four thousand, six hundred fifty-nine".