20472287 has 8 divisors (see below), whose sum is σ = 22505472. Its totient is φ = 18467800.

The previous prime is 20472281. The next prime is 20472293. The reversal of 20472287 is 78227402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20472281) and next prime (20472293).

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 20472287 - 2⁶ = 20472223 is a prime.

It is a super-2 number, since 2×20472287² = 838229070020738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5663 + ... + 8544.

It is an arithmetic number, because the mean of its divisors is an integer number (2813184).

Almost surely, 2^20472287 is an apocalyptic number.

20472287 is a deficient number, since it is larger than the sum of its proper divisors (2033185).

20472287 is a wasteful number, since it uses less digits than its factorization.

20472287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14349.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20472287 is about 4524.6311451874. The cubic root of 20472287 is about 273.5618006856.

Adding to 20472287 its reverse (78227402), we get a palindrome (98699689).

It can be divided in two parts, 2047 and 2287, that added together give a palindrome (4334).

The spelling of 20472287 in words is "twenty million, four hundred seventy-two thousand, two hundred eighty-seven".