20440433400 has 96 divisors (see below), whose sum is σ = 63438908400. Its totient is φ = 5444454400.

The previous prime is 20440433369. The next prime is 20440433413. The reversal of 20440433400 is 433404402.

It is a happy number.

It is a super-2 number, since 2×20440433400² (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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 509266 + ... + 547934.

Almost surely, 2^20440433400 is an apocalyptic number.

20440433400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440433400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31719454200).

20440433400 is an abundant number, since it is smaller than the sum of its proper divisors (42998475000).

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

20440433400 is a wasteful number, since it uses less digits than its factorization.

20440433400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39569 (or 39560 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

Adding to 20440433400 its reverse (433404402), we get a palindrome (20873837802).

The spelling of 20440433400 in words is "twenty billion, four hundred forty million, four hundred thirty-three thousand, four hundred".