20667147 has 4 divisors (see below), whose sum is σ = 27556200. Its totient is φ = 13778096.

The previous prime is 20667137. The next prime is 20667151. The reversal of 20667147 is 74176602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20667147 is a prime.

It is a super-3 number, since 3×20667147³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20667107) 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, 3444522 + ... + 3444527.

It is an arithmetic number, because the mean of its divisors is an integer number (6889050).

Almost surely, 2^20667147 is an apocalyptic number.

20667147 is a deficient number, since it is larger than the sum of its proper divisors (6889053).

20667147 is an equidigital number, since it uses as much as digits as its factorization.

20667147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889052.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20667147 is about 4546.1133949782. The cubic root of 20667147 is about 274.4270030616.

It can be divided in two parts, 20667 and 147, that multiplied together give a square (3038049 = 1743²).

The spelling of 20667147 in words is "twenty million, six hundred sixty-seven thousand, one hundred forty-seven".