20342709 has 6 divisors (see below), whose sum is σ = 29383926. Its totient is φ = 13561800.

The previous prime is 20342701. The next prime is 20342723. The reversal of 20342709 is 90724302.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 4422609 = 3990^2 + 2103^2 .

It is not a de Polignac number, because 20342709 - 2³ = 20342701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1130142 + ... + 1130159.

It is an arithmetic number, because the mean of its divisors is an integer number (4897321).

Almost surely, 2^20342709 is an apocalyptic number.

It is an amenable number.

20342709 is a deficient number, since it is larger than the sum of its proper divisors (9041217).

20342709 is a wasteful number, since it uses less digits than its factorization.

20342709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260307 (or 2260304 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20342709 is about 4510.2892368450. The cubic root of 20342709 is about 272.9834148440.

The spelling of 20342709 in words is "twenty million, three hundred forty-two thousand, seven hundred nine".