20155929 has 8 divisors (see below), whose sum is σ = 26941920. Its totient is φ = 13403616.

The previous prime is 20155913. The next prime is 20155951. The reversal of 20155929 is 92955102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20155929 - 2⁴ = 20155913 is a prime.

It is a super-2 number, since 2×20155929² = 812522947706082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20155929.

It is not an unprimeable number, because it can be changed into a prime (20155909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6987 + ... + 9440.

It is an arithmetic number, because the mean of its divisors is an integer number (3367740).

Almost surely, 2^20155929 is an apocalyptic number.

It is an amenable number.

20155929 is a deficient number, since it is larger than the sum of its proper divisors (6785991).

20155929 is a wasteful number, since it uses less digits than its factorization.

20155929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16839.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 20155929 is about 4489.5354993585. The cubic root of 20155929 is about 272.1453636568.

The spelling of 20155929 in words is "twenty million, one hundred fifty-five thousand, nine hundred twenty-nine".