20667725571 has 16 divisors (see below), whose sum is σ = 29202756768. Its totient is φ = 12956966400.

The previous prime is 20667725569. The next prime is 20667725591. The reversal of 20667725571 is 17552776602.

It is not a de Polignac number, because 20667725571 - 2¹ = 20667725569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20667725571.

It is not an unprimeable number, because it can be changed into a prime (20667725501) 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, 111340 + ... + 231801.

It is an arithmetic number, because the mean of its divisors is an integer number (1825172298).

Almost surely, 2^20667725571 is an apocalyptic number.

20667725571 is a deficient number, since it is larger than the sum of its proper divisors (8535031197).

20667725571 is a wasteful number, since it uses less digits than its factorization.

20667725571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344342.

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 20667725571 in words is "twenty billion, six hundred sixty-seven million, seven hundred twenty-five thousand, five hundred seventy-one".