20345902340 has 24 divisors (see below), whose sum is σ = 43125711552. Its totient is φ = 8062300640.

The previous prime is 20345902321. The next prime is 20345902349. The reversal of 20345902340 is 4320954302.

It is a junction number, because it is equal to n+sod(n) for n = 20345902297 and 20345902306.

It is not an unprimeable number, because it can be changed into a prime (20345902349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4751576 + ... + 4755855.

It is an arithmetic number, because the mean of its divisors is an integer number (1796904648).

Almost surely, 2^20345902340 is an apocalyptic number.

20345902340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345902340 is an abundant number, since it is smaller than the sum of its proper divisors (22779809212).

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

20345902340 is a wasteful number, since it uses less digits than its factorization.

20345902340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9507547 (or 9507545 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The spelling of 20345902340 in words is "twenty billion, three hundred forty-five million, nine hundred two thousand, three hundred forty".