20472617 has 8 divisors (see below), whose sum is σ = 23054592. Its totient is φ = 18010800.

The previous prime is 20472611. The next prime is 20472619. The reversal of 20472617 is 71627402.

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

It is a cyclic number.

It is not a de Polignac number, because 20472617 - 2¹² = 20468521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20472617.

It is not an unprimeable number, because it can be changed into a prime (20472611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29678 + ... + 30359.

It is an arithmetic number, because the mean of its divisors is an integer number (2881824).

Almost surely, 2^20472617 is an apocalyptic number.

It is an amenable number.

20472617 is a deficient number, since it is larger than the sum of its proper divisors (2581975).

20472617 is a wasteful number, since it uses less digits than its factorization.

20472617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60079.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20472617 is about 4524.6676121015. The cubic root of 20472617 is about 273.5632705574.

It can be divided in two parts, 2047 and 2617, that added together give a palindrome (4664).

The spelling of 20472617 in words is "twenty million, four hundred seventy-two thousand, six hundred seventeen".