20349918 has 48 divisors (see below), whose sum is σ = 47376576. Its totient is φ = 6289920.

The previous prime is 20349913. The next prime is 20349929. The reversal of 20349918 is 81994302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20349911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21883 + ... + 22793.

It is an arithmetic number, because the mean of its divisors is an integer number (987012).

Almost surely, 2^20349918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20349918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23688288).

20349918 is an abundant number, since it is smaller than the sum of its proper divisors (27026658).

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

20349918 is a wasteful number, since it uses less digits than its factorization.

20349918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1006 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20349918 is about 4511.0883387493. The cubic root of 20349918 is about 273.0156574363.

The spelling of 20349918 in words is "twenty million, three hundred forty-nine thousand, nine hundred eighteen".