20490318 has 24 divisors (see below), whose sum is σ = 45829056. Its totient is φ = 6609600.

The previous prime is 20490311. The next prime is 20490319. The reversal of 20490318 is 81309402.

It is a super-2 number, since 2×20490318² = 839706263482248, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20490291 and 20490300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17803 + ... + 18918.

It is an arithmetic number, because the mean of its divisors is an integer number (1909544).

Almost surely, 2^20490318 is an apocalyptic number.

20490318 is an abundant number, since it is smaller than the sum of its proper divisors (25338738).

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

20490318 is a wasteful number, since it uses less digits than its factorization.

20490318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36760 (or 36757 counting only the distinct ones).

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

The square root of 20490318 is about 4526.6232447598. The cubic root of 20490318 is about 273.6420904518.

The spelling of 20490318 in words is "twenty million, four hundred ninety thousand, three hundred eighteen".