20943156 has 72 divisors (see below), whose sum is σ = 55339200. Its totient is φ = 6150144.

The previous prime is 20943127. The next prime is 20943157. The reversal of 20943156 is 65134902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943157) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 46420 + ... + 46868.

It is an arithmetic number, because the mean of its divisors is an integer number (768600).

Almost surely, 2^20943156 is an apocalyptic number.

20943156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20943156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27669600).

20943156 is an abundant number, since it is smaller than the sum of its proper divisors (34396044).

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

20943156 is a wasteful number, since it uses less digits than its factorization.

20943156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20943156 is about 4576.3693032796. The cubic root of 20943156 is about 275.6432589032.

It can be divided in two parts, 209 and 43156, that added together give a triangular number (43365 = T₂₉₄).

The spelling of 20943156 in words is "twenty million, nine hundred forty-three thousand, one hundred fifty-six".