20430440140 has 24 divisors (see below), whose sum is σ = 46804281552. Its totient is φ = 7429250880.

The previous prime is 20430440131. The next prime is 20430440143. The reversal of 20430440140 is 4104403402.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20430440143) 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 7 ways as a sum of consecutive naturals, for example, 46432599 + ... + 46433038.

It is an arithmetic number, because the mean of its divisors is an integer number (1950178398).

Almost surely, 2^20430440140 is an apocalyptic number.

20430440140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430440140 is an abundant number, since it is smaller than the sum of its proper divisors (26373841412).

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

20430440140 is a wasteful number, since it uses less digits than its factorization.

20430440140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92865657 (or 92865655 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20430440140 its reverse (4104403402), we get a palindrome (24534843542).

The spelling of 20430440140 in words is "twenty billion, four hundred thirty million, four hundred forty thousand, one hundred forty".