20349690 has 32 divisors (see below), whose sum is σ = 49671360. Its totient is φ = 5334144.

The previous prime is 20349683. The next prime is 20349737. The reversal of 20349690 is 9694302.

It is a super-2 number, since 2×20349690² = 828219766192200, which contains 22 as substring.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 3979 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (1552230).

Almost surely, 2^20349690 is an apocalyptic number.

20349690 is an abundant number, since it is smaller than the sum of its proper divisors (29321670).

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

20349690 is a wasteful number, since it uses less digits than its factorization.

20349690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11566.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20349690 is about 4511.0630676150. The cubic root of 20349690 is about 273.0146378122.

The spelling of 20349690 in words is "twenty million, three hundred forty-nine thousand, six hundred ninety".