20790447 has 16 divisors (see below), whose sum is σ = 28474368. Its totient is φ = 13488480.

The previous prime is 20790443. The next prime is 20790461. The reversal of 20790447 is 74409702.

It is not a de Polignac number, because 20790447 - 2² = 20790443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20790443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18298 + ... + 19400.

It is an arithmetic number, because the mean of its divisors is an integer number (1779648).

Almost surely, 2^20790447 is an apocalyptic number.

20790447 is a deficient number, since it is larger than the sum of its proper divisors (7683921).

20790447 is a wasteful number, since it uses less digits than its factorization.

20790447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270.

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

The square root of 20790447 is about 4559.6542632090. The cubic root of 20790447 is about 274.9716642981.

The spelling of 20790447 in words is "twenty million, seven hundred ninety thousand, four hundred forty-seven".