20408190 has 32 divisors (see below), whose sum is σ = 53433216. Its totient is φ = 4947360.

The previous prime is 20408189. The next prime is 20408191. The reversal of 20408190 is 9180402.

It is an interprime number because it is at equal distance from previous prime (20408189) and next prime (20408191).

It is a super-2 number, since 2×20408190² = 832988438152200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20408190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30592 + ... + 31251.

It is an arithmetic number, because the mean of its divisors is an integer number (1669788).

Almost surely, 2^20408190 is an apocalyptic number.

20408190 is an abundant number, since it is smaller than the sum of its proper divisors (33025026).

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

20408190 is a wasteful number, since it uses less digits than its factorization.

20408190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61864.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20408190 is about 4517.5424735137. The cubic root of 20408190 is about 273.2760025836.

Adding to 20408190 its reverse (9180402), we get a palindrome (29588592).

The spelling of 20408190 in words is "twenty million, four hundred eight thousand, one hundred ninety".