20415490 has 32 divisors (see below), whose sum is σ = 39398400. Its totient is φ = 7596864.

The previous prime is 20415469. The next prime is 20415491. The reversal of 20415490 is 9451402.

It is not an unprimeable number, because it can be changed into a prime (20415491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7311 + ... + 9709.

It is an arithmetic number, because the mean of its divisors is an integer number (1231200).

Almost surely, 2^20415490 is an apocalyptic number.

20415490 is a deficient number, since it is larger than the sum of its proper divisors (18982910).

20415490 is a wasteful number, since it uses less digits than its factorization.

20415490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20415490 is about 4518.3503626877. The cubic root of 20415490 is about 273.3085822654.

Adding to 20415490 its reverse (9451402), we get a palindrome (29866892).

The spelling of 20415490 in words is "twenty million, four hundred fifteen thousand, four hundred ninety".