20621267 has 8 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 20022760.

The previous prime is 20621261. The next prime is 20621269. The reversal of 20621267 is 76212602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20621267 - 2¹⁸ = 20359123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20621261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2792 + ... + 7002.

It is an arithmetic number, because the mean of its divisors is an integer number (2653560).

Almost surely, 2^20621267 is an apocalyptic number.

20621267 is a deficient number, since it is larger than the sum of its proper divisors (607213).

20621267 is an equidigital number, since it uses as much as digits as its factorization.

20621267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20621267 is about 4541.0645227744. The cubic root of 20621267 is about 274.2237813443.

Adding to 20621267 its reverse (76212602), we get a palindrome (96833869).

The spelling of 20621267 in words is "twenty million, six hundred twenty-one thousand, two hundred sixty-seven".