20910190 has 64 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 6848640.

The previous prime is 20910179. The next prime is 20910257. The reversal of 20910190 is 9101902.

It is a super-2 number, since 2×20910190² = 874472091672200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251889 + ... + 251971.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^20910190 is an apocalyptic number.

20910190 is an abundant number, since it is smaller than the sum of its proper divisors (24086930).

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

20910190 is a wasteful number, since it uses less digits than its factorization.

20910190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 20910190 is about 4572.7661212881. The cubic root of 20910190 is about 275.4985556625.

The spelling of 20910190 in words is "twenty million, nine hundred ten thousand, one hundred ninety".