20767481 has 4 divisors (see below), whose sum is σ = 23734272. Its totient is φ = 17800692.

The previous prime is 20767477. The next prime is 20767501. The reversal of 20767481 is 18476702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20767481 - 2² = 20767477 is a prime.

It is a super-2 number, since 2×20767481² = 862576534170722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20367481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483385 + ... + 1483398.

It is an arithmetic number, because the mean of its divisors is an integer number (5933568).

Almost surely, 2^20767481 is an apocalyptic number.

It is an amenable number.

20767481 is a deficient number, since it is larger than the sum of its proper divisors (2966791).

20767481 is an equidigital number, since it uses as much as digits as its factorization.

20767481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2966790.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20767481 is about 4557.1351746465. The cubic root of 20767481 is about 274.8703785819.

The spelling of 20767481 in words is "twenty million, seven hundred sixty-seven thousand, four hundred eighty-one".