20716390 has 16 divisors (see below), whose sum is σ = 37653408. Its totient is φ = 8205696.

The previous prime is 20716379. The next prime is 20716391. The reversal of 20716390 is 9361702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716391) 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, 9027 + ... + 11086.

It is an arithmetic number, because the mean of its divisors is an integer number (2353338).

Almost surely, 2^20716390 is an apocalyptic number.

20716390 is a deficient number, since it is larger than the sum of its proper divisors (16937018).

20716390 is a wasteful number, since it uses less digits than its factorization.

20716390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20223.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 20716390 is about 4551.5261176884. The cubic root of 20716390 is about 274.6447865526.

The spelling of 20716390 in words is "twenty million, seven hundred sixteen thousand, three hundred ninety".