20147945369 has 16 divisors (see below), whose sum is σ = 21567546000. Its totient is φ = 18754658304.

The previous prime is 20147945359. The next prime is 20147945387. The reversal of 20147945369 is 96354974102.

It can be written as a sum of positive squares in 8 ways, for example, as 740112025 + 19407833344 = 27205^2 + 139312^2 .

It is a cyclic number.

It is not a de Polignac number, because 20147945369 - 2¹² = 20147941273 is a prime.

It is a super-2 number, since 2×20147945369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20147945359) 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 15 ways as a sum of consecutive naturals, for example, 3210767 + ... + 3217035.

It is an arithmetic number, because the mean of its divisors is an integer number (1347971625).

Almost surely, 2^20147945369 is an apocalyptic number.

It is an amenable number.

20147945369 is a deficient number, since it is larger than the sum of its proper divisors (1419600631).

20147945369 is a wasteful number, since it uses less digits than its factorization.

20147945369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 20147945369 in words is "twenty billion, one hundred forty-seven million, nine hundred forty-five thousand, three hundred sixty-nine".