20434431100 has 36 divisors (see below), whose sum is σ = 44781774408. Its totient is φ = 8092840000.

The previous prime is 20434431097. The next prime is 20434431109. The reversal of 20434431100 is 113443402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434431109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1001506 + ... + 1021705.

It is an arithmetic number, because the mean of its divisors is an integer number (1243938178).

Almost surely, 2^20434431100 is an apocalyptic number.

20434431100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20434431100 is an abundant number, since it is smaller than the sum of its proper divisors (24347343308).

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

20434431100 is a wasteful number, since it uses less digits than its factorization.

20434431100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023326 (or 2023319 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20434431100 its reverse (113443402), we get a palindrome (20547874502).

The spelling of 20434431100 in words is "twenty billion, four hundred thirty-four million, four hundred thirty-one thousand, one hundred".