20344155 has 72 divisors (see below), whose sum is σ = 39300912. Its totient is φ = 8930304.

The previous prime is 20344147. The next prime is 20344157. The reversal of 20344155 is 55144302.

It is not a de Polignac number, because 20344155 - 2³ = 20344147 is a prime.

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 71 ways as a sum of consecutive naturals, for example, 1070736 + ... + 1070754.

It is an arithmetic number, because the mean of its divisors is an integer number (545846).

Almost surely, 2^20344155 is an apocalyptic number.

20344155 is a deficient number, since it is larger than the sum of its proper divisors (18956757).

20344155 is a wasteful number, since it uses less digits than its factorization.

20344155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20344155 is about 4510.4495341374. The cubic root of 20344155 is about 272.9898827578.

Adding to 20344155 its reverse (55144302), we get a palindrome (75488457).

The spelling of 20344155 in words is "twenty million, three hundred forty-four thousand, one hundred fifty-five".