20259447 has 16 divisors (see below), whose sum is σ = 29191680. Its totient is φ = 12424032.

The previous prime is 20259419. The next prime is 20259457. The reversal of 20259447 is 74495202.

It is not a de Polignac number, because 20259447 - 2⁸ = 20259191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20259457) 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 15 ways as a sum of consecutive naturals, for example, 13278 + ... + 14724.

It is an arithmetic number, because the mean of its divisors is an integer number (1824480).

Almost surely, 2^20259447 is an apocalyptic number.

20259447 is a deficient number, since it is larger than the sum of its proper divisors (8932233).

20259447 is a wasteful number, since it uses less digits than its factorization.

20259447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20259447 is about 4501.0495442730. The cubic root of 20259447 is about 272.6104683556.

It can be divided in two parts, 20259 and 447, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20259447 in words is "twenty million, two hundred fifty-nine thousand, four hundred forty-seven".