20675247 has 16 divisors (see below), whose sum is σ = 29743200. Its totient is φ = 12726272.

The previous prime is 20675227. The next prime is 20675251. The reversal of 20675247 is 74257602.

It is a cyclic number.

It is not a de Polignac number, because 20675247 - 2⁸ = 20674991 is a prime.

It is a super-2 number, since 2×20675247² = 854931677022018, which contains 22 as substring.

20675247 is a modest number, since divided by 5247 gives 2067 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1122 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (1858950).

Almost surely, 2^20675247 is an apocalyptic number.

20675247 is a deficient number, since it is larger than the sum of its proper divisors (9067953).

20675247 is a wasteful number, since it uses less digits than its factorization.

20675247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7722.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 20675247 is about 4547.0041785774. The cubic root of 20675247 is about 274.4628501057.

The spelling of 20675247 in words is "twenty million, six hundred seventy-five thousand, two hundred forty-seven".