20820918 has 8 divisors (see below), whose sum is σ = 41641848. Its totient is φ = 6940304.

The previous prime is 20820889. The next prime is 20820929. The reversal of 20820918 is 81902802.

It is a sphenic number, since it is the product of 3 distinct primes.

20820918 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1735071 + ... + 1735082.

It is an arithmetic number, because the mean of its divisors is an integer number (5205231).

Almost surely, 2^20820918 is an apocalyptic number.

20820918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20820918 is a wasteful number, since it uses less digits than its factorization.

20820918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3470158.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 20820918 is about 4562.9944115679. The cubic root of 20820918 is about 275.1059338432.

The spelling of 20820918 in words is "twenty million, eight hundred twenty thousand, nine hundred eighteen".