20472569 has 8 divisors (see below), whose sum is σ = 22095360. Its totient is φ = 18856656.

The previous prime is 20472559. The next prime is 20472583. The reversal of 20472569 is 96527402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20472569 - 2²⁰ = 19423993 is a prime.

It is a super-3 number, since 3×20472569³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20472559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5672 + ... + 8550.

It is an arithmetic number, because the mean of its divisors is an integer number (2761920).

Almost surely, 2^20472569 is an apocalyptic number.

It is an amenable number.

20472569 is a deficient number, since it is larger than the sum of its proper divisors (1622791).

20472569 is a wasteful number, since it uses less digits than its factorization.

20472569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20472569 is about 4524.6623078413. The cubic root of 20472569 is about 273.5630567588.

The spelling of 20472569 in words is "twenty million, four hundred seventy-two thousand, five hundred sixty-nine".