20980918 has 12 divisors (see below), whose sum is σ = 36609732. Its totient is φ = 8991780.

The previous prime is 20980913. The next prime is 20980919. The reversal of 20980918 is 81908902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20980913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106948 + ... + 107143.

It is an arithmetic number, because the mean of its divisors is an integer number (3050811).

Almost surely, 2^20980918 is an apocalyptic number.

20980918 is a deficient number, since it is larger than the sum of its proper divisors (15628814).

20980918 is a wasteful number, since it uses less digits than its factorization.

20980918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214107 (or 214100 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 20980918 is about 4580.4932048853. The cubic root of 20980918 is about 275.8088275667.

The spelling of 20980918 in words is "twenty million, nine hundred eighty thousand, nine hundred eighteen".