20966737 has 8 divisors (see below), whose sum is σ = 23248512. Its totient is φ = 18747600.

The previous prime is 20966723. The next prime is 20966749. The reversal of 20966737 is 73766902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20966737 - 2²³ = 12578129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20966737.

It is not an unprimeable number, because it can be changed into a prime (20966707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14953 + ... + 16294.

It is an arithmetic number, because the mean of its divisors is an integer number (2906064).

Almost surely, 2^20966737 is an apocalyptic number.

It is an amenable number.

20966737 is a deficient number, since it is larger than the sum of its proper divisors (2281775).

20966737 is a wasteful number, since it uses less digits than its factorization.

20966737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31319.

The product of its (nonzero) digits is 95256, while the sum is 40.

The square root of 20966737 is about 4578.9449658191. The cubic root of 20966737 is about 275.7466738433.

The spelling of 20966737 in words is "twenty million, nine hundred sixty-six thousand, seven hundred thirty-seven".