20152609 has 2 divisors, whose sum is σ = 20152610. Its totient is φ = 20152608.

The previous prime is 20152603. The next prime is 20152619. The reversal of 20152609 is 90625102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14653584 + 5499025 = 3828^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 20152609 - 2¹³ = 20144417 is a prime.

It is a super-2 number, since 2×20152609² = 812255299013762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20152603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10076304 + 10076305.

It is an arithmetic number, because the mean of its divisors is an integer number (10076305).

Almost surely, 2^20152609 is an apocalyptic number.

It is an amenable number.

20152609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20152609 is an equidigital number, since it uses as much as digits as its factorization.

20152609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20152609 is about 4489.1657354123. The cubic root of 20152609 is about 272.1304206225.

It can be divided in two parts, 2015 and 2609, that added together give a square (4624 = 68²).

The spelling of 20152609 in words is "twenty million, one hundred fifty-two thousand, six hundred nine".