20322918 has 144 divisors (see below), whose sum is σ = 58426368. Its totient is φ = 4989600.

The previous prime is 20322833. The next prime is 20322919. The reversal of 20322918 is 81922302.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20322891 and 20322900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20322919) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 472605 + ... + 472647.

Almost surely, 2^20322918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20322918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29213184).

20322918 is an abundant number, since it is smaller than the sum of its proper divisors (38103450).

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

20322918 is a wasteful number, since it uses less digits than its factorization.

20322918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20322918 is about 4508.0947195018. The cubic root of 20322918 is about 272.8948594842.

It can be divided in two parts, 2032 and 2918, that added together give a triangular number (4950 = T₉₉).

The spelling of 20322918 in words is "twenty million, three hundred twenty-two thousand, nine hundred eighteen".