20243420 has 12 divisors (see below), whose sum is σ = 42511224. Its totient is φ = 8097360.

The previous prime is 20243407. The next prime is 20243467. The reversal of 20243420 is 2434202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506066 + ... + 506105.

It is an arithmetic number, because the mean of its divisors is an integer number (3542602).

Almost surely, 2^20243420 is an apocalyptic number.

20243420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20243420 is an abundant number, since it is smaller than the sum of its proper divisors (22267804).

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

20243420 is a wasteful number, since it uses less digits than its factorization.

20243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012180 (or 1012178 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20243420 is about 4499.2688294877. The cubic root of 20243420 is about 272.5385631253.

Adding to 20243420 its reverse (2434202), we get a palindrome (22677622).

The spelling of 20243420 in words is "twenty million, two hundred forty-three thousand, four hundred twenty".