20115629 has 4 divisors (see below), whose sum is σ = 20127900. Its totient is φ = 20103360.

The previous prime is 20115619. The next prime is 20115653. The reversal of 20115629 is 92651102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13875625 + 6240004 = 3725^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 20115629 - 2²⁰ = 19067053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20115598 and 20115607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3212 + ... + 7109.

It is an arithmetic number, because the mean of its divisors is an integer number (5031975).

Almost surely, 2^20115629 is an apocalyptic number.

It is an amenable number.

20115629 is a deficient number, since it is larger than the sum of its proper divisors (12271).

20115629 is a wasteful number, since it uses less digits than its factorization.

20115629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12270.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20115629 is about 4485.0450387928. The cubic root of 20115629 is about 271.9638657665.

The spelling of 20115629 in words is "twenty million, one hundred fifteen thousand, six hundred twenty-nine".