20424004402420 has 24 divisors (see below), whose sum is σ = 42891186031848. Its totient is φ = 8169453801600.

The previous prime is 20424004402411. The next prime is 20424004402429. The reversal of 20424004402420 is 2420440042402.

It is an interprime number because it is at equal distance from previous prime (20424004402411) and next prime (20424004402429).

It can be written as a sum of positive squares in 4 ways, for example, as 3833991131364 + 16590013271056 = 1958058^2 + 4073084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424004402429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8112151 + ... + 10327390.

It is an arithmetic number, because the mean of its divisors is an integer number (1787132751327).

Almost surely, 2^{20424004402420} is an apocalyptic number.

20424004402420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20424004402420 is an abundant number, since it is smaller than the sum of its proper divisors (22467181629428).

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

20424004402420 is a wasteful number, since it uses less digits than its factorization.

20424004402420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18494931 (or 18494929 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 20424004402420 its reverse (2420440042402), we get a palindrome (22844444444822).

The spelling of 20424004402420 in words is "twenty trillion, four hundred twenty-four billion, four million, four hundred two thousand, four hundred twenty".