20903707 has 4 divisors (see below), whose sum is σ = 22804056. Its totient is φ = 19003360.

The previous prime is 20903689. The next prime is 20903723. The reversal of 20903707 is 70730902.

It is a happy number.

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 20903707 - 2¹⁵ = 20870939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20903777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 950158 + ... + 950179.

It is an arithmetic number, because the mean of its divisors is an integer number (5701014).

Almost surely, 2^20903707 is an apocalyptic number.

20903707 is a deficient number, since it is larger than the sum of its proper divisors (1900349).

20903707 is a wasteful number, since it uses less digits than its factorization.

20903707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900348.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 20903707 is about 4572.0571956177. The cubic root of 20903707 is about 275.4700808415.

The spelling of 20903707 in words is "twenty million, nine hundred three thousand, seven hundred seven".