16720761 has 4 divisors (see below), whose sum is σ = 22294352. Its totient is φ = 11147172.

The previous prime is 16720699. The next prime is 16720789. The reversal of 16720761 is 16702761.

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 16720761 - 2¹⁹ = 16196473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16727761) 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, 2786791 + ... + 2786796.

It is an arithmetic number, because the mean of its divisors is an integer number (5573588).

Almost surely, 2^16720761 is an apocalyptic number.

It is an amenable number.

16720761 is a deficient number, since it is larger than the sum of its proper divisors (5573591).

16720761 is an equidigital number, since it uses as much as digits as its factorization.

16720761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573590.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 16720761 is about 4089.1027133101. The cubic root of 16720761 is about 255.7125323386.

The spelling of 16720761 in words is "sixteen million, seven hundred twenty thousand, seven hundred sixty-one".