20281420 has 24 divisors (see below), whose sum is σ = 42921648. Its totient is φ = 8049600.

The previous prime is 20281403. The next prime is 20281451. The reversal of 20281420 is 2418202.

It is a super-2 number, since 2×20281420² = 822671994432800, 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, 1251 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (1788402).

Almost surely, 2^20281420 is an apocalyptic number.

20281420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20281420 is an abundant number, since it is smaller than the sum of its proper divisors (22640228).

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

20281420 is a wasteful number, since it uses less digits than its factorization.

20281420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7881 (or 7879 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20281420 is about 4503.4897579544. The cubic root of 20281420 is about 272.7089887406.

Adding to 20281420 its reverse (2418202), we get a palindrome (22699622).

The spelling of 20281420 in words is "twenty million, two hundred eighty-one thousand, four hundred twenty".