20344156 has 24 divisors (see below), whose sum is σ = 41459040. Its totient is φ = 8553792.

The previous prime is 20344147. The next prime is 20344157. The reversal of 20344156 is 65144302.

It is a self number, because there is not a number n which added to its sum of digits gives 20344156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344157) 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, 5371 + ... + 8338.

It is an arithmetic number, because the mean of its divisors is an integer number (1727460).

Almost surely, 2^20344156 is an apocalyptic number.

It is an amenable number.

20344156 is an abundant number, since it is smaller than the sum of its proper divisors (21114884).

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

20344156 is a wasteful number, since it uses less digits than its factorization.

20344156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13773 (or 13771 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20344156 is about 4510.4496449911. The cubic root of 20344156 is about 272.9898872307.

Adding to 20344156 its reverse (65144302), we get a palindrome (85488458).

The spelling of 20344156 in words is "twenty million, three hundred forty-four thousand, one hundred fifty-six".