20942866 has 8 divisors (see below), whose sum is σ = 35902080. Its totient is φ = 8975508.

The previous prime is 20942863. The next prime is 20942869. The reversal of 20942866 is 66824902.

It is an interprime number because it is at equal distance from previous prime (20942863) and next prime (20942869).

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

It is not an unprimeable number, because it can be changed into a prime (20942863) 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 3 ways as a sum of consecutive naturals, for example, 747946 + ... + 747973.

It is an arithmetic number, because the mean of its divisors is an integer number (4487760).

Almost surely, 2^20942866 is an apocalyptic number.

20942866 is a deficient number, since it is larger than the sum of its proper divisors (14959214).

20942866 is a wasteful number, since it uses less digits than its factorization.

20942866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495928.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 20942866 is about 4576.3376186641. The cubic root of 20942866 is about 275.6419866194.

The spelling of 20942866 in words is "twenty million, nine hundred forty-two thousand, eight hundred sixty-six".