20281490 has 16 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 8053680.

The previous prime is 20281489. The next prime is 20281523. The reversal of 20281490 is 9418202.

It is a super-2 number, since 2×20281490² = 822677673240200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5906 + ... + 8685.

It is an arithmetic number, because the mean of its divisors is an integer number (2298240).

Almost surely, 2^20281490 is an apocalyptic number.

20281490 is a deficient number, since it is larger than the sum of its proper divisors (16490350).

20281490 is a wasteful number, since it uses less digits than its factorization.

20281490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14737.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20281490 is about 4503.4975296984. The cubic root of 20281490 is about 272.7093024860.

Adding to 20281490 its reverse (9418202), we get a palindrome (29699692).

The spelling of 20281490 in words is "twenty million, two hundred eighty-one thousand, four hundred ninety".