20913907 has 16 divisors (see below), whose sum is σ = 24652800. Its totient is φ = 17372160.

The previous prime is 20913887. The next prime is 20913931. The reversal of 20913907 is 70931902.

It is a cyclic number.

It is not a de Polignac number, because 20913907 - 2⁷ = 20913779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20913967) 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 15 ways as a sum of consecutive naturals, for example, 32307 + ... + 32947.

It is an arithmetic number, because the mean of its divisors is an integer number (1540800).

Almost surely, 2^20913907 is an apocalyptic number.

20913907 is a deficient number, since it is larger than the sum of its proper divisors (3738893).

20913907 is an equidigital number, since it uses as much as digits as its factorization.

20913907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 20913907 is about 4573.1725311866. The cubic root of 20913907 is about 275.5148789234.

The spelling of 20913907 in words is "twenty million, nine hundred thirteen thousand, nine hundred seven".