20345156 has 24 divisors (see below), whose sum is σ = 40012224. Its totient is φ = 8981280.

The previous prime is 20345093. The next prime is 20345161. The reversal of 20345156 is 65154302.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7310 + ... + 9701.

It is an arithmetic number, because the mean of its divisors is an integer number (1667176).

Almost surely, 2^20345156 is an apocalyptic number.

20345156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20345156 is a deficient number, since it is larger than the sum of its proper divisors (19667068).

20345156 is a wasteful number, since it uses less digits than its factorization.

20345156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17051 (or 17049 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20345156 is about 4510.5604973218. The cubic root of 20345156 is about 272.9943600207.

Adding to 20345156 its reverse (65154302), we get a palindrome (85499458).

The spelling of 20345156 in words is "twenty million, three hundred forty-five thousand, one hundred fifty-six".