20701509 has 8 divisors (see below), whose sum is σ = 28054752. Its totient is φ = 13574640.

The previous prime is 20701493. The next prime is 20701511. The reversal of 20701509 is 90510702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20701509 - 2⁴ = 20701493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20701579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56379 + ... + 56744.

It is an arithmetic number, because the mean of its divisors is an integer number (3506844).

Almost surely, 2^20701509 is an apocalyptic number.

It is an amenable number.

20701509 is a deficient number, since it is larger than the sum of its proper divisors (7353243).

20701509 is a wasteful number, since it uses less digits than its factorization.

20701509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113187.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 20701509 is about 4549.8910975978. The cubic root of 20701509 is about 274.5790098408.

The spelling of 20701509 in words is "twenty million, seven hundred one thousand, five hundred nine".