20716890 has 32 divisors (see below), whose sum is σ = 50936256. Its totient is φ = 5389440.

The previous prime is 20716873. The next prime is 20716907. The reversal of 20716890 is 9861702.

It is an interprime number because it is at equal distance from previous prime (20716873) and next prime (20716907).

It is a Curzon number.

It is an unprimeable number.

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, 7192 + ... + 9651.

It is an arithmetic number, because the mean of its divisors is an integer number (1591758).

Almost surely, 2^20716890 is an apocalyptic number.

20716890 is an abundant number, since it is smaller than the sum of its proper divisors (30219366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20716890 is a wasteful number, since it uses less digits than its factorization.

20716890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16894.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20716890 is about 4551.5810439890. The cubic root of 20716890 is about 274.6469960960.

The spelling of 20716890 in words is "twenty million, seven hundred sixteen thousand, eight hundred ninety".