20100230440 has 32 divisors (see below), whose sum is σ = 45235665000. Its totient is φ = 8038288384.

The previous prime is 20100230431. The next prime is 20100230441. The reversal of 20100230440 is 4403200102.

It can be written as a sum of positive squares in 4 ways, for example, as 19862392356 + 237838084 = 140934^2 + 15422^2 .

It is a super-2 number, since 2×20100230440² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20100230441) 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, 131916 + ... + 240004.

Almost surely, 2^20100230440 is an apocalyptic number.

20100230440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100230440 is an abundant number, since it is smaller than the sum of its proper divisors (25135434560).

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

20100230440 is a wasteful number, since it uses less digits than its factorization.

20100230440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112749 (or 112745 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20100230440 its reverse (4403200102), we get a palindrome (24503430542).

The spelling of 20100230440 in words is "twenty billion, one hundred million, two hundred thirty thousand, four hundred forty".