20021424 has 20 divisors (see below), whose sum is σ = 51722136. Its totient is φ = 6673792.

The previous prime is 20021413. The next prime is 20021429. The reversal of 20021424 is 42412002.

It is not an unprimeable number, because it can be changed into a prime (20021429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208509 + ... + 208604.

Almost surely, 2^20021424 is an apocalyptic number.

20021424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20021424 is an abundant number, since it is smaller than the sum of its proper divisors (31700712).

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

20021424 is a wasteful number, since it uses less digits than its factorization.

20021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417124 (or 417118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20021424 is about 4474.5305899055. The cubic root of 20021424 is about 271.5386498772.

Adding to 20021424 its reverse (42412002), we get a palindrome (62433426).

The spelling of 20021424 in words is "twenty million, twenty-one thousand, four hundred twenty-four".