20716491 has 8 divisors (see below), whose sum is σ = 28823040. Its totient is φ = 13210472.

The previous prime is 20716483. The next prime is 20716541. The reversal of 20716491 is 19461702.

It is a happy number.

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 20716491 - 2³ = 20716483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20716391) 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, 150051 + ... + 150188.

It is an arithmetic number, because the mean of its divisors is an integer number (3602880).

Almost surely, 2^20716491 is an apocalyptic number.

20716491 is a deficient number, since it is larger than the sum of its proper divisors (8106549).

20716491 is a wasteful number, since it uses less digits than its factorization.

20716491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300265.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20716491 is about 4551.5372128546. The cubic root of 20716491 is about 274.6452328833.

The spelling of 20716491 in words is "twenty million, seven hundred sixteen thousand, four hundred ninety-one".