20916494 has 16 divisors (see below), whose sum is σ = 33554736. Its totient is φ = 9744000.

The previous prime is 20916491. The next prime is 20916509. The reversal of 20916494 is 49461902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916491) 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 7 ways as a sum of consecutive naturals, for example, 389 + ... + 6479.

It is an arithmetic number, because the mean of its divisors is an integer number (2097171).

Almost surely, 2^20916494 is an apocalyptic number.

20916494 is a deficient number, since it is larger than the sum of its proper divisors (12638242).

20916494 is a wasteful number, since it uses less digits than its factorization.

20916494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20916494 is about 4573.4553676624. The cubic root of 20916494 is about 275.5262386310.

The spelling of 20916494 in words is "twenty million, nine hundred sixteen thousand, four hundred ninety-four".