20945432305 has 32 divisors (see below), whose sum is σ = 29607022080. Its totient is φ = 13924431360.

The previous prime is 20945432297. The next prime is 20945432309. The reversal of 20945432305 is 50323454902.

It is not a de Polignac number, because 20945432305 - 2³ = 20945432297 is a prime.

It is a super-2 number, since 2×20945432305² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (20945432309) by changing a digit.

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, 335116 + ... + 392674.

It is an arithmetic number, because the mean of its divisors is an integer number (925219440).

Almost surely, 2^20945432305 is an apocalyptic number.

It is an amenable number.

20945432305 is a deficient number, since it is larger than the sum of its proper divisors (8661589775).

20945432305 is a wasteful number, since it uses less digits than its factorization.

20945432305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57889.

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 20945432305 in words is "twenty billion, nine hundred forty-five million, four hundred thirty-two thousand, three hundred five".