20102432240 has 80 divisors (see below), whose sum is σ = 51251692896. Its totient is φ = 7272038400.

The previous prime is 20102432227. The next prime is 20102432243. The reversal of 20102432240 is 4223420102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×20102432240³ (a number of 32 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102432243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110660 + ... + 229020.

Almost surely, 2^20102432240 is an apocalyptic number.

20102432240 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 20102432240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25625846448).

20102432240 is an abundant number, since it is smaller than the sum of its proper divisors (31149260656).

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

20102432240 is a wasteful number, since it uses less digits than its factorization.

20102432240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118578 (or 118572 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20102432240 its reverse (4223420102), we get a palindrome (24325852342).

The spelling of 20102432240 in words is "twenty billion, one hundred two million, four hundred thirty-two thousand, two hundred forty".