20424004420 has 24 divisors (see below), whose sum is σ = 42907828824. Its totient is φ = 8166283776.

The previous prime is 20424004397. The next prime is 20424004481. The reversal of 20424004420 is 2440042402.

It can be written as a sum of positive squares in 4 ways, for example, as 371178756 + 20052825664 = 19266^2 + 141608^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20424004391 and 20424004400.

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, 156597 + ... + 255676.

It is an arithmetic number, because the mean of its divisors is an integer number (1787826201).

Almost surely, 2^20424004420 is an apocalyptic number.

20424004420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20424004420 is an abundant number, since it is smaller than the sum of its proper divisors (22483824404).

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

20424004420 is a wasteful number, since it uses less digits than its factorization.

20424004420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414759 (or 414757 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 20424004420 its reverse (2440042402), we get a palindrome (22864046822).

The spelling of 20424004420 in words is "twenty billion, four hundred twenty-four million, four thousand, four hundred twenty".