20040424440 has 64 divisors (see below), whose sum is σ = 61587660960. Its totient is φ = 5213767680.

The previous prime is 20040424433. The next prime is 20040424447. The reversal of 20040424440 is 4442404002.

It is an interprime number because it is at equal distance from previous prime (20040424433) and next prime (20040424447).

It is a super-2 number, since 2×20040424440² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20040424440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040424447) 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, 2031709 + ... + 2041548.

Almost surely, 2^20040424440 is an apocalyptic number.

20040424440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20040424440 is an abundant number, since it is smaller than the sum of its proper divisors (41547236520).

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

20040424440 is a wasteful number, since it uses less digits than its factorization.

20040424440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073312 (or 4073308 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20040424440 its reverse (4442404002), we get a palindrome (24482828442).

The spelling of 20040424440 in words is "twenty billion, forty million, four hundred twenty-four thousand, four hundred forty".