20123818 has 32 divisors (see below), whose sum is σ = 37558080. Its totient is φ = 7944960.

The previous prime is 20123813. The next prime is 20123843. The reversal of 20123818 is 81832102.

It is a junction number, because it is equal to n+sod(n) for n = 20123792 and 20123801.

It is not an unprimeable number, because it can be changed into a prime (20123813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2793 + ... + 6931.

It is an arithmetic number, because the mean of its divisors is an integer number (1173690).

Almost surely, 2^20123818 is an apocalyptic number.

20123818 is a deficient number, since it is larger than the sum of its proper divisors (17434262).

20123818 is a wasteful number, since it uses less digits than its factorization.

20123818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4182.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20123818 is about 4485.9578687277. The cubic root of 20123818 is about 272.0007659292. Note that the first 3 decimals are identical.

The spelling of 20123818 in words is "twenty million, one hundred twenty-three thousand, eight hundred eighteen".