20966739 has 8 divisors (see below), whose sum is σ = 28919760. Its totient is φ = 13495776.

The previous prime is 20966723. The next prime is 20966749. The reversal of 20966739 is 93766902.

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

It is not a de Polignac number, because 20966739 - 2⁴ = 20966723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20966739.

It is not an unprimeable number, because it can be changed into a prime (20966719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120412 + ... + 120585.

It is an arithmetic number, because the mean of its divisors is an integer number (3614970).

Almost surely, 2^20966739 is an apocalyptic number.

20966739 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20966739 is a deficient number, since it is larger than the sum of its proper divisors (7953021).

20966739 is a wasteful number, since it uses less digits than its factorization.

20966739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241029.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 20966739 is about 4578.9451842100. The cubic root of 20966739 is about 275.7466826111.

The spelling of 20966739 in words is "twenty million, nine hundred sixty-six thousand, seven hundred thirty-nine".