20424240020 has 24 divisors (see below), whose sum is σ = 42893911368. Its totient is φ = 8169123200.

The previous prime is 20424240013. The next prime is 20424240029. The reversal of 20424240020 is 2004242402.

It can be written as a sum of positive squares in 4 ways, for example, as 45535504 + 20378704516 = 6748^2 + 142754^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20424239974 and 20424240001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424240029) 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, 367250 + ... + 419190.

It is an arithmetic number, because the mean of its divisors is an integer number (1787246307).

Almost surely, 2^20424240020 is an apocalyptic number.

20424240020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20424240020 is an abundant number, since it is smaller than the sum of its proper divisors (22469671348).

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

20424240020 is a wasteful number, since it uses less digits than its factorization.

20424240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71611 (or 71609 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20424240020 its reverse (2004242402), we get a palindrome (22428482422).

The spelling of 20424240020 in words is "twenty billion, four hundred twenty-four million, two hundred forty thousand, twenty".