20345204140 has 24 divisors (see below), whose sum is σ = 42728821632. Its totient is φ = 8137340160.

The previous prime is 20345204137. The next prime is 20345204167. The reversal of 20345204140 is 4140254302.

It is a happy number.

It is an unprimeable number.

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, 214437 + ... + 294403.

It is an arithmetic number, because the mean of its divisors is an integer number (1780367568).

Almost surely, 2^20345204140 is an apocalyptic number.

20345204140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345204140 is an abundant number, since it is smaller than the sum of its proper divisors (22383617492).

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

20345204140 is a wasteful number, since it uses less digits than its factorization.

20345204140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92697 (or 92695 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20345204140 its reverse (4140254302), we get a palindrome (24485458442).

The spelling of 20345204140 in words is "twenty billion, three hundred forty-five million, two hundred four thousand, one hundred forty".