20155229 has 4 divisors (see below), whose sum is σ = 20170080. Its totient is φ = 20140380.

The previous prime is 20155169. The next prime is 20155249. The reversal of 20155229 is 92255102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20155229 - 2²⁰ = 19106653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20155198 and 20155207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5159 + ... + 8180.

It is an arithmetic number, because the mean of its divisors is an integer number (5042520).

Almost surely, 2^20155229 is an apocalyptic number.

It is an amenable number.

20155229 is a deficient number, since it is larger than the sum of its proper divisors (14851).

20155229 is a wasteful number, since it uses less digits than its factorization.

20155229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14850.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20155229 is about 4489.4575396143. The cubic root of 20155229 is about 272.1422131536.

The spelling of 20155229 in words is "twenty million, one hundred fifty-five thousand, two hundred twenty-nine".