20420140312 has 64 divisors (see below), whose sum is σ = 46027618560. Its totient is φ = 8368617600.

The previous prime is 20420140309. The next prime is 20420140357. The reversal of 20420140312 is 21304102402.

It is a self number, because there is not a number n which added to its sum of digits gives 20420140312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158364 + ... + 256747.

It is an arithmetic number, because the mean of its divisors is an integer number (719181540).

Almost surely, 2^20420140312 is an apocalyptic number.

20420140312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20420140312 is an abundant number, since it is smaller than the sum of its proper divisors (25607478248).

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

20420140312 is a wasteful number, since it uses less digits than its factorization.

20420140312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415184 (or 415180 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20420140312 its reverse (21304102402), we get a palindrome (41724242714).

The spelling of 20420140312 in words is "twenty billion, four hundred twenty million, one hundred forty thousand, three hundred twelve".