20404420420 has 24 divisors (see below), whose sum is σ = 42964176024. Its totient is φ = 8139883776.

The previous prime is 20404420411. The next prime is 20404420507. The reversal of 20404420420 is 2402440402.

It can be written as a sum of positive squares in 4 ways, for example, as 2081549376 + 18322871044 = 45624^2 + 135362^2 .

It is a super-2 number, since 2×20404420420² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20404420391 and 20404420400.

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, 1360129 + ... + 1375048.

It is an arithmetic number, because the mean of its divisors is an integer number (1790174001).

Almost surely, 2^20404420420 is an apocalyptic number.

20404420420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404420420 is an abundant number, since it is smaller than the sum of its proper divisors (22559755604).

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

20404420420 is a wasteful number, since it uses less digits than its factorization.

20404420420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735559 (or 2735557 counting only the distinct ones).

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

Adding to 20404420420 its reverse (2402440402), we get a palindrome (22806860822).

The spelling of 20404420420 in words is "twenty billion, four hundred four million, four hundred twenty thousand, four hundred twenty".