20171490 has 32 divisors (see below), whose sum is σ = 49000896. Its totient is φ = 5313600.

The previous prime is 20171477. The next prime is 20171491. The reversal of 20171490 is 9417102.

It is a self number, because there is not a number n which added to its sum of digits gives 20171490.

It is not an unprimeable number, because it can be changed into a prime (20171491) 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 15 ways as a sum of consecutive naturals, for example, 1561 + ... + 6540.

It is an arithmetic number, because the mean of its divisors is an integer number (1531278).

Almost surely, 2^20171490 is an apocalyptic number.

20171490 is an abundant number, since it is smaller than the sum of its proper divisors (28829406).

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

20171490 is a wasteful number, since it uses less digits than its factorization.

20171490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8194.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 20171490 is about 4491.2681950647. The cubic root of 20171490 is about 272.2153805182.

Adding to 20171490 its reverse (9417102), we get a palindrome (29588592).

The spelling of 20171490 in words is "twenty million, one hundred seventy-one thousand, four hundred ninety".