20340918 has 24 divisors (see below), whose sum is σ = 47462688. Its totient is φ = 6258672.

The previous prime is 20340913. The next prime is 20340937. The reversal of 20340918 is 81904302.

It is a junction number, because it is equal to n+sod(n) for n = 20340891 and 20340900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340911) 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, 43230 + ... + 43697.

It is an arithmetic number, because the mean of its divisors is an integer number (1977612).

Almost surely, 2^20340918 is an apocalyptic number.

20340918 is an abundant number, since it is smaller than the sum of its proper divisors (27121770).

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

20340918 is a wasteful number, since it uses less digits than its factorization.

20340918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86948 (or 86945 counting only the distinct ones).

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

The square root of 20340918 is about 4510.0906864497. The cubic root of 20340918 is about 272.9754033308.

The spelling of 20340918 in words is "twenty million, three hundred forty thousand, nine hundred eighteen".