20123418 has 24 divisors (see below), whose sum is σ = 46818432. Its totient is φ = 5749464.

The previous prime is 20123417. The next prime is 20123431. The reversal of 20123418 is 81432102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20123394 and 20123403.

It is not an unprimeable number, because it can be changed into a prime (20123417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33930 + ... + 34517.

It is an arithmetic number, because the mean of its divisors is an integer number (1950768).

Almost surely, 2^20123418 is an apocalyptic number.

20123418 is an abundant number, since it is smaller than the sum of its proper divisors (26695014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20123418 is a wasteful number, since it uses less digits than its factorization.

20123418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68466 (or 68459 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20123418 is about 4485.9132849399. The cubic root of 20123418 is about 271.9989637360.

The spelling of 20123418 in words is "twenty million, one hundred twenty-three thousand, four hundred eighteen".