20071247 has 4 divisors (see below), whose sum is σ = 22938576. Its totient is φ = 17203920.

The previous prime is 20071217. The next prime is 20071267. The reversal of 20071247 is 74217002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20071247 - 2⁸ = 20070991 is a prime.

It is a super-2 number, since 2×20071247² = 805709912270018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20071217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1433654 + ... + 1433667.

It is an arithmetic number, because the mean of its divisors is an integer number (5734644).

Almost surely, 2^20071247 is an apocalyptic number.

20071247 is a deficient number, since it is larger than the sum of its proper divisors (2867329).

20071247 is an equidigital number, since it uses as much as digits as its factorization.

20071247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867328.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20071247 is about 4480.0945302527. The cubic root of 20071247 is about 271.7637031920.

Adding to 20071247 its reverse (74217002), we get a palindrome (94288249).

The spelling of 20071247 in words is "twenty million, seventy-one thousand, two hundred forty-seven".