20508190 has 8 divisors (see below), whose sum is σ = 36914760. Its totient is φ = 8203272.

The previous prime is 20508167. The next prime is 20508197. The reversal of 20508190 is 9180502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20508190² = 841171714152200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025400 + ... + 1025419.

It is an arithmetic number, because the mean of its divisors is an integer number (4614345).

Almost surely, 2^20508190 is an apocalyptic number.

20508190 is a deficient number, since it is larger than the sum of its proper divisors (16406570).

20508190 is a wasteful number, since it uses less digits than its factorization.

20508190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050826.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20508190 is about 4528.5969129522. The cubic root of 20508190 is about 273.7216257435.

Adding to 20508190 its reverse (9180502), we get a palindrome (29688692).

The spelling of 20508190 in words is "twenty million, five hundred eight thousand, one hundred ninety".