20443156 has 12 divisors (see below), whose sum is σ = 35909440. Its totient is φ = 10183320.

The previous prime is 20443141. The next prime is 20443201. The reversal of 20443156 is 65134402.

It is a self number, because there is not a number n which added to its sum of digits gives 20443156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8346 + ... + 10513.

Almost surely, 2^20443156 is an apocalyptic number.

It is an amenable number.

20443156 is a deficient number, since it is larger than the sum of its proper divisors (15466284).

20443156 is a wasteful number, since it uses less digits than its factorization.

20443156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19134 (or 19132 counting only the distinct ones).

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

The square root of 20443156 is about 4521.4108417617. The cubic root of 20443156 is about 273.4319843524.

Adding to 20443156 its reverse (65134402), we get a palindrome (85577558).

The spelling of 20443156 in words is "twenty million, four hundred forty-three thousand, one hundred fifty-six".