20966451 has 8 divisors (see below), whose sum is σ = 30496704. Its totient is φ = 12706920.

The previous prime is 20966431. The next prime is 20966459. The reversal of 20966451 is 15466902.

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

It is not a de Polignac number, because 20966451 - 2¹⁵ = 20933683 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 635347 = 20966451 / (2 + 0 + 9 + 6 + 6 + 4 + 5 + 1).

It is not an unprimeable number, because it can be changed into a prime (20966459) 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, 317641 + ... + 317706.

It is an arithmetic number, because the mean of its divisors is an integer number (3812088).

Almost surely, 2^20966451 is an apocalyptic number.

20966451 is a deficient number, since it is larger than the sum of its proper divisors (9530253).

20966451 is a wasteful number, since it uses less digits than its factorization.

20966451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635361.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20966451 is about 4578.9137358111. The cubic root of 20966451 is about 275.7454200493.

The spelling of 20966451 in words is "twenty million, nine hundred sixty-six thousand, four hundred fifty-one".