20346156 has 18 divisors (see below), whose sum is σ = 51430652. Its totient is φ = 6782040.

The previous prime is 20346121. The next prime is 20346187. The reversal of 20346156 is 65164302.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282550 + ... + 282621.

Almost surely, 2^20346156 is an apocalyptic number.

It is an amenable number.

20346156 is an abundant number, since it is smaller than the sum of its proper divisors (31084496).

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

20346156 is a wasteful number, since it uses less digits than its factorization.

20346156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565181 (or 565176 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20346156 is about 4510.6713469283. The cubic root of 20346156 is about 272.9988326642.

It can be divided in two parts, 20346 and 156, that added together give a palindrome (20502).

The spelling of 20346156 in words is "twenty million, three hundred forty-six thousand, one hundred fifty-six".