20649467 has 8 divisors (see below), whose sum is σ = 21046272. Its totient is φ = 20255400.

The previous prime is 20649451. The next prime is 20649481. The reversal of 20649467 is 76494602.

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 20649467 - 2⁴ = 20649451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20649467.

It is not an unprimeable number, because it can be changed into a prime (20649667) 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, 20342 + ... + 21332.

It is an arithmetic number, because the mean of its divisors is an integer number (2630784).

Almost surely, 2^20649467 is an apocalyptic number.

20649467 is a deficient number, since it is larger than the sum of its proper divisors (396805).

20649467 is an equidigital number, since it uses as much as digits as its factorization.

20649467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 20649467 is about 4544.1684607858. The cubic root of 20649467 is about 274.3487265969.

The spelling of 20649467 in words is "twenty million, six hundred forty-nine thousand, four hundred sixty-seven".