20493907 has 16 divisors (see below), whose sum is σ = 24120000. Its totient is φ = 17404800.

The previous prime is 20493901. The next prime is 20493911. The reversal of 20493907 is 70939402.

It is not a de Polignac number, because 20493907 - 2¹⁵ = 20461139 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 (20493901) 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 15 ways as a sum of consecutive naturals, for example, 50907 + ... + 51307.

It is an arithmetic number, because the mean of its divisors is an integer number (1507500).

Almost surely, 2^20493907 is an apocalyptic number.

20493907 is a deficient number, since it is larger than the sum of its proper divisors (3626093).

20493907 is an equidigital number, since it uses as much as digits as its factorization.

20493907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20493907 is about 4527.0196597762. The cubic root of 20493907 is about 273.6580661942.

The spelling of 20493907 in words is "twenty million, four hundred ninety-three thousand, nine hundred seven".