20702491 has 8 divisors (see below), whose sum is σ = 21557520. Its totient is φ = 19856928.

The previous prime is 20702483. The next prime is 20702497. The reversal of 20702491 is 19420702.

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 20702491 - 2³ = 20702483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20702497) 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, 2280 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (2694690).

Almost surely, 2^20702491 is an apocalyptic number.

20702491 is a deficient number, since it is larger than the sum of its proper divisors (855029).

20702491 is a wasteful number, since it uses less digits than its factorization.

20702491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20702491 is about 4549.9990109889. Note that the first 3 decimals coincide. The cubic root of 20702491 is about 274.5833514297.

The spelling of 20702491 in words is "twenty million, seven hundred two thousand, four hundred ninety-one".