20281250 has 56 divisors (see below), whose sum is σ = 42186960. Its totient is φ = 7250000.

The previous prime is 20281241. The next prime is 20281253. The reversal of 20281250 is 5218202.

It is a super-2 number, since 2×20281250² = 822658203125000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20281253) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 343721 + ... + 343779.

Almost surely, 2^20281250 is an apocalyptic number.

20281250 is an abundant number, since it is smaller than the sum of its proper divisors (21905710).

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

20281250 is an frugal number, since it uses more digits than its factorization.

20281250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20281250 is about 4503.4708836630. The cubic root of 20281250 is about 272.7082267844.

Adding to 20281250 its reverse (5218202), we get a palindrome (25499452).

The spelling of 20281250 in words is "twenty million, two hundred eighty-one thousand, two hundred fifty".