20701909 has 8 divisors (see below), whose sum is σ = 21655872. Its totient is φ = 19752480.

The previous prime is 20701897. The next prime is 20701913. The reversal of 20701909 is 90910702.

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 20701909 - 2⁷ = 20701781 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 (20701999) 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, 11169 + ... + 12889.

It is an arithmetic number, because the mean of its divisors is an integer number (2706984).

Almost surely, 2^20701909 is an apocalyptic number.

It is an amenable number.

20701909 is a deficient number, since it is larger than the sum of its proper divisors (953963).

20701909 is a wasteful number, since it uses less digits than its factorization.

20701909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 20701909 is about 4549.9350544815. The cubic root of 20701909 is about 274.5807783253.

The spelling of 20701909 in words is "twenty million, seven hundred one thousand, nine hundred nine".