20424402 has 24 divisors (see below), whose sum is σ = 44504460. Its totient is φ = 6769440.

The previous prime is 20424401. The next prime is 20424409. The reversal of 20424402 is 20442402.

It can be written as a sum of positive squares in 2 ways, for example, as 16818201 + 3606201 = 4101^2 + 1899^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20424401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124 + ... + 6392.

Almost surely, 2^20424402 is an apocalyptic number.

20424402 is an abundant number, since it is smaller than the sum of its proper divisors (24080058).

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

20424402 is a wasteful number, since it uses less digits than its factorization.

20424402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458 (or 6455 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20424402 is about 4519.3364557200. The cubic root of 20424402 is about 273.3483457284.

Adding to 20424402 its reverse (20442402), we get a palindrome (40866804).

The spelling of 20424402 in words is "twenty million, four hundred twenty-four thousand, four hundred two".