20634147 has 12 divisors (see below), whose sum is σ = 29859024. Its totient is φ = 13731120.

The previous prime is 20634143. The next prime is 20634161. The reversal of 20634147 is 74143602.

20634147 is a `hidden beast` number, since 20 + 634 + 1 + 4 + 7 = 666.

It is not a de Polignac number, because 20634147 - 2² = 20634143 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20634147.

It is not an unprimeable number, because it can be changed into a prime (20634143) 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 11 ways as a sum of consecutive naturals, for example, 4122 + ... + 7632.

It is an arithmetic number, because the mean of its divisors is an integer number (2488252).

Almost surely, 2^20634147 is an apocalyptic number.

20634147 is a deficient number, since it is larger than the sum of its proper divisors (9224877).

20634147 is a wasteful number, since it uses less digits than its factorization.

20634147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170 (or 4167 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20634147 is about 4542.4824710724. The cubic root of 20634147 is about 274.2808626606.

Adding to 20634147 its reverse (74143602), we get a palindrome (94777749).

The spelling of 20634147 in words is "twenty million, six hundred thirty-four thousand, one hundred forty-seven".