20349860 has 24 divisors (see below), whose sum is σ = 42831096. Its totient is φ = 8121600.

The previous prime is 20349859. The next prime is 20349907. The reversal of 20349860 is 6894302.

It can be written as a sum of positive squares in 4 ways, for example, as 3833764 + 16516096 = 1958^2 + 4064^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11174 + ... + 12866.

It is an arithmetic number, because the mean of its divisors is an integer number (1784629).

Almost surely, 2^20349860 is an apocalyptic number.

20349860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20349860 is an abundant number, since it is smaller than the sum of its proper divisors (22481236).

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

20349860 is a wasteful number, since it uses less digits than its factorization.

20349860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303 (or 2301 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20349860 is about 4511.0819101408. The cubic root of 20349860 is about 273.0153980590.

The spelling of 20349860 in words is "twenty million, three hundred forty-nine thousand, eight hundred sixty".