20501707 has 4 divisors (see below), whose sum is σ = 20514736. Its totient is φ = 20488680.

The previous prime is 20501699. The next prime is 20501731. The reversal of 20501707 is 70710502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20501707 - 2³ = 20501699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501797) 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 3 ways as a sum of consecutive naturals, for example, 3768 + ... + 7429.

It is an arithmetic number, because the mean of its divisors is an integer number (5128684).

Almost surely, 2^20501707 is an apocalyptic number.

20501707 is a deficient number, since it is larger than the sum of its proper divisors (13029).

20501707 is a wasteful number, since it uses less digits than its factorization.

20501707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13028.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 20501707 is about 4527.8810717597. The cubic root of 20501707 is about 273.6927799617.

The spelling of 20501707 in words is "twenty million, five hundred one thousand, seven hundred seven".