20531190 has 16 divisors (see below), whose sum is σ = 49274928. Its totient is φ = 5474976.

The previous prime is 20531183. The next prime is 20531213. The reversal of 20531190 is 9113502.

It is a super-2 number, since 2×20531190² = 843059525632200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342157 + ... + 342216.

It is an arithmetic number, because the mean of its divisors is an integer number (3079683).

Almost surely, 2^20531190 is an apocalyptic number.

20531190 is an abundant number, since it is smaller than the sum of its proper divisors (28743738).

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

20531190 is a wasteful number, since it uses less digits than its factorization.

20531190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684383.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 20531190 is about 4531.1356192460. The cubic root of 20531190 is about 273.8239140707.

Adding to 20531190 its reverse (9113502), we get a palindrome (29644692).

The spelling of 20531190 in words is "twenty million, five hundred thirty-one thousand, one hundred ninety".