20801156 has 12 divisors (see below), whose sum is σ = 36644160. Its totient is φ = 10331400.

The previous prime is 20801117. The next prime is 20801167. The reversal of 20801156 is 65110802.

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, 16616 + ... + 17823.

It is an arithmetic number, because the mean of its divisors is an integer number (3053680).

Almost surely, 2^20801156 is an apocalyptic number.

It is an amenable number.

20801156 is a deficient number, since it is larger than the sum of its proper divisors (15843004).

20801156 is a wasteful number, since it uses less digits than its factorization.

20801156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34594 (or 34592 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 20801156 is about 4560.8284335195. The cubic root of 20801156 is about 275.0188681269.

Adding to 20801156 its reverse (65110802), we get a palindrome (85911958).

The spelling of 20801156 in words is "twenty million, eight hundred one thousand, one hundred fifty-six".