20716570 has 16 divisors (see below), whose sum is σ = 42617088. Its totient is φ = 7102800.

The previous prime is 20716561. The next prime is 20716573. The reversal of 20716570 is 7561702.

It is not an unprimeable number, because it can be changed into a prime (20716573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147906 + ... + 148045.

It is an arithmetic number, because the mean of its divisors is an integer number (2663568).

Almost surely, 2^20716570 is an apocalyptic number.

20716570 is an abundant number, since it is smaller than the sum of its proper divisors (21900518).

20716570 is a wasteful number, since it uses less digits than its factorization.

20716570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295965.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 20716570 is about 4551.5458912330. The cubic root of 20716570 is about 274.6455819924.

The spelling of 20716570 in words is "twenty million, seven hundred sixteen thousand, five hundred seventy".