20486709 has 8 divisors (see below), whose sum is σ = 30350720. Its totient is φ = 13657788.

The previous prime is 20486707. The next prime is 20486743. The reversal of 20486709 is 90768402.

It is not a de Polignac number, because 20486709 - 2¹ = 20486707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20486707) 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, 379357 + ... + 379410.

It is an arithmetic number, because the mean of its divisors is an integer number (3793840).

Almost surely, 2^20486709 is an apocalyptic number.

It is an amenable number.

20486709 is a deficient number, since it is larger than the sum of its proper divisors (9864011).

20486709 is an equidigital number, since it uses as much as digits as its factorization.

20486709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758776 (or 758770 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20486709 is about 4526.2245856784. The cubic root of 20486709 is about 273.6260238020.

The spelling of 20486709 in words is "twenty million, four hundred eighty-six thousand, seven hundred nine".