20130890 has 32 divisors (see below), whose sum is σ = 41322960. Its totient is φ = 6994944.

The previous prime is 20130881. The next prime is 20130931. The reversal of 20130890 is 9803102.

It can be written as a sum of positive squares in 8 ways, for example, as 3736489 + 16394401 = 1933^2 + 4049^2 .

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 15 ways as a sum of consecutive naturals, for example, 2345 + ... + 6764.

Almost surely, 2^20130890 is an apocalyptic number.

20130890 is an abundant number, since it is smaller than the sum of its proper divisors (21192070).

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

20130890 is a wasteful number, since it uses less digits than its factorization.

20130890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9146.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20130890 is about 4486.7460369404. The cubic root of 20130890 is about 272.0326247632.

Adding to 20130890 its reverse (9803102), we get a palindrome (29933992).

The spelling of 20130890 in words is "twenty million, one hundred thirty thousand, eight hundred ninety".