20165530 has 32 divisors (see below), whose sum is σ = 45256320. Its totient is φ = 6285120.

The previous prime is 20165521. The next prime is 20165533. The reversal of 20165530 is 3556102.

It is a happy number.

20165530 is nontrivially palindromic in base 9.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20165533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12325 + ... + 13864.

It is an arithmetic number, because the mean of its divisors is an integer number (1414260).

Almost surely, 2^20165530 is an apocalyptic number.

20165530 is an abundant number, since it is smaller than the sum of its proper divisors (25090790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20165530 is a wasteful number, since it uses less digits than its factorization.

20165530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26214.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20165530 is about 4490.6046363491. The cubic root of 20165530 is about 272.1885677000.

The spelling of 20165530 in words is "twenty million, one hundred sixty-five thousand, five hundred thirty".