20782156 has 24 divisors (see below), whose sum is σ = 38112480. Its totient is φ = 9896832.

The previous prime is 20782141. The next prime is 20782159. The reversal of 20782156 is 65128702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20782159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36240 + ... + 36808.

It is an arithmetic number, because the mean of its divisors is an integer number (1588020).

Almost surely, 2^20782156 is an apocalyptic number.

It is an amenable number.

20782156 is a deficient number, since it is larger than the sum of its proper divisors (17330324).

20782156 is a wasteful number, since it uses less digits than its factorization.

20782156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 20782156 is about 4558.7450027392. The cubic root of 20782156 is about 274.9351075534.

The spelling of 20782156 in words is "twenty million, seven hundred eighty-two thousand, one hundred fifty-six".