20942818 has 12 divisors (see below), whose sum is σ = 34017138. Its totient is φ = 9665760.

The previous prime is 20942813. The next prime is 20942833. The reversal of 20942818 is 81824902.

It can be written as a sum of positive squares in 3 ways, for example, as 14876449 + 6066369 = 3857^2 + 2463^2 .

It is a super-2 number, since 2×20942818² = 877203251562248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20942813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30643 + ... + 31318.

Almost surely, 2^20942818 is an apocalyptic number.

20942818 is a deficient number, since it is larger than the sum of its proper divisors (13074320).

20942818 is a wasteful number, since it uses less digits than its factorization.

20942818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61989 (or 61976 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 20942818 is about 4576.3323742928. The cubic root of 20942818 is about 275.6417760334.

The spelling of 20942818 in words is "twenty million, nine hundred forty-two thousand, eight hundred eighteen".