20345317740 has 72 divisors (see below), whose sum is σ = 67324512528. Its totient is φ = 4932197760.

The previous prime is 20345317723. The next prime is 20345317757. The reversal of 20345317740 is 4771354302.

20345317740 is a `hidden beast` number, since 20 + 34 + 531 + 7 + 74 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20345317723) and next prime (20345317757).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20345317695 and 20345317704.

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 23 ways as a sum of consecutive naturals, for example, 5135727 + ... + 5139686.

It is an arithmetic number, because the mean of its divisors is an integer number (935062674).

Almost surely, 2^20345317740 is an apocalyptic number.

20345317740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345317740 is an abundant number, since it is smaller than the sum of its proper divisors (46979194788).

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

20345317740 is a wasteful number, since it uses less digits than its factorization.

20345317740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275439 (or 10275434 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The spelling of 20345317740 in words is "twenty billion, three hundred forty-five million, three hundred seventeen thousand, seven hundred forty".