20159613 has 6 divisors (see below), whose sum is σ = 29119454. Its totient is φ = 13439736.

The previous prime is 20159609. The next prime is 20159617. The reversal of 20159613 is 31695102.

It is an interprime number because it is at equal distance from previous prime (20159609) and next prime (20159617).

It can be written as a sum of positive squares in only one way, i.e., 20088324 + 71289 = 4482^2 + 267^2 .

It is not a de Polignac number, because 20159613 - 2² = 20159609 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 (20159617) 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, 1119970 + ... + 1119987.

Almost surely, 2^20159613 is an apocalyptic number.

It is an amenable number.

20159613 is a deficient number, since it is larger than the sum of its proper divisors (8959841).

20159613 is a wasteful number, since it uses less digits than its factorization.

20159613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239963 (or 2239960 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20159613 is about 4489.9457680466. The cubic root of 20159613 is about 272.1619431034.

It can be divided in two parts, 2015 and 9613, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 20159613 in words is "twenty million, one hundred fifty-nine thousand, six hundred thirteen".