20345949306 has 64 divisors (see below), whose sum is σ = 46360823040. Its totient is φ = 6610164480.

The previous prime is 20345949269. The next prime is 20345949331. The reversal of 20345949306 is 60394954302.

20345949306 is a `hidden beast` number, since 20 + 3 + 4 + 594 + 9 + 30 + 6 = 666.

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 31 ways as a sum of consecutive naturals, for example, 2637451 + ... + 2645153.

It is an arithmetic number, because the mean of its divisors is an integer number (724387860).

Almost surely, 2^20345949306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20345949306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23180411520).

20345949306 is an abundant number, since it is smaller than the sum of its proper divisors (26014873734).

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

20345949306 is a wasteful number, since it uses less digits than its factorization.

20345949306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8948 (or 8942 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 20345949306 in words is "twenty billion, three hundred forty-five million, nine hundred forty-nine thousand, three hundred six".