20340440100 has 54 divisors (see below), whose sum is σ = 63755982290. Its totient is φ = 5424117120.

The previous prime is 20340440083. The next prime is 20340440173. The reversal of 20340440100 is 104404302.

It can be written as a sum of positive squares in 3 ways, for example, as 398481444 + 19941958656 = 19962^2 + 141216^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11299345 + ... + 11301144.

Almost surely, 2^20340440100 is an apocalyptic number.

20340440100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340440100 is an abundant number, since it is smaller than the sum of its proper divisors (43415542190).

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

20340440100 is a wasteful number, since it uses less digits than its factorization.

20340440100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22600509 (or 22600499 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20340440100 its reverse (104404302), we get a palindrome (20444844402).

The spelling of 20340440100 in words is "twenty billion, three hundred forty million, four hundred forty thousand, one hundred".