20451190 has 16 divisors (see below), whose sum is σ = 37018800. Its totient is φ = 8134560.

The previous prime is 20451181. The next prime is 20451199. The reversal of 20451190 is 9115402.

It is an interprime number because it is at equal distance from previous prime (20451181) and next prime (20451199).

It is a super-2 number, since 2×20451190² = 836502344832200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451199) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3840 + ... + 7459.

It is an arithmetic number, because the mean of its divisors is an integer number (2313675).

Almost surely, 2^20451190 is an apocalyptic number.

20451190 is a deficient number, since it is larger than the sum of its proper divisors (16567610).

20451190 is a wasteful number, since it uses less digits than its factorization.

20451190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11487.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20451190 is about 4522.2991939941. The cubic root of 20451190 is about 273.4677985365.

Adding to 20451190 its reverse (9115402), we get a palindrome (29566592).

The spelling of 20451190 in words is "twenty million, four hundred fifty-one thousand, one hundred ninety".