20281030 has 32 divisors (see below), whose sum is σ = 45515520. Its totient is φ = 6321120.

The previous prime is 20281013. The next prime is 20281039. The reversal of 20281030 is 3018202.

It is a happy number.

It is a super-2 number, since 2×20281030² = 822640355721800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20280995 and 20281013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281039) 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, 12400 + ... + 13939.

It is an arithmetic number, because the mean of its divisors is an integer number (1422360).

Almost surely, 2^20281030 is an apocalyptic number.

20281030 is an abundant number, since it is smaller than the sum of its proper divisors (25234490).

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

20281030 is a wasteful number, since it uses less digits than its factorization.

20281030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26364.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20281030 is about 4503.4464579919. The cubic root of 20281030 is about 272.7072407172.

Adding to 20281030 its reverse (3018202), we get a palindrome (23299232).

The spelling of 20281030 in words is "twenty million, two hundred eighty-one thousand, thirty".