20435243434440 has 64 divisors (see below), whose sum is σ = 61306107024960. Its totient is φ = 5449364762880.

The previous prime is 20435243434409. The next prime is 20435243434457. The reversal of 20435243434440 is 4443434253402.

It is a super-2 number, since 2×20435243434440² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20435243434392 and 20435243434401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23764395 + ... + 24609285.

It is an arithmetic number, because the mean of its divisors is an integer number (957907922265).

Almost surely, 2^{20435243434440} is an apocalyptic number.

20435243434440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20435243434440 is an abundant number, since it is smaller than the sum of its proper divisors (40870863590520).

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

20435243434440 is a wasteful number, since it uses less digits than its factorization.

20435243434440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046462 (or 1046458 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 42.

Adding to 20435243434440 its reverse (4443434253402), we get a palindrome (24878677687842).

The spelling of 20435243434440 in words is "twenty trillion, four hundred thirty-five billion, two hundred forty-three million, four hundred thirty-four thousand, four hundred forty".