20672479 has 4 divisors (see below), whose sum is σ = 21022920. Its totient is φ = 20322040.

The previous prime is 20672471. The next prime is 20672501. The reversal of 20672479 is 97427602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20672479 - 2³ = 20672471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20672471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175132 + ... + 175249.

It is an arithmetic number, because the mean of its divisors is an integer number (5255730).

Almost surely, 2^20672479 is an apocalyptic number.

20672479 is a deficient number, since it is larger than the sum of its proper divisors (350441).

20672479 is an equidigital number, since it uses as much as digits as its factorization.

20672479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350440.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 20672479 is about 4546.6997921569. The cubic root of 20672479 is about 274.4506012061.

The spelling of 20672479 in words is "twenty million, six hundred seventy-two thousand, four hundred seventy-nine".