20424400020 has 48 divisors (see below), whose sum is σ = 63542579520. Its totient is φ = 5446506528.

The previous prime is 20424400019. The next prime is 20424400027. The reversal of 20424400020 is 2000442402.

20424400020 is a `hidden beast` number, since 204 + 2 + 440 + 0 + 0 + 20 = 666.

It is a super-2 number, since 2×20424400020² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 20424399966 and 20424400002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424400027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18910942 + ... + 18912021.

It is an arithmetic number, because the mean of its divisors is an integer number (1323803740).

Almost surely, 2^20424400020 is an apocalyptic number.

20424400020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20424400020 is an abundant number, since it is smaller than the sum of its proper divisors (43118179500).

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

20424400020 is a wasteful number, since it uses less digits than its factorization.

20424400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37822981 (or 37822973 counting only the distinct ones).

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

Adding to 20424400020 its reverse (2000442402), we get a palindrome (22424842422).

The spelling of 20424400020 in words is "twenty billion, four hundred twenty-four million, four hundred thousand, twenty".