20870066 has 32 divisors (see below), whose sum is σ = 37110528. Its totient is φ = 8616960.

The previous prime is 20870063. The next prime is 20870071. The reversal of 20870066 is 66007802.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20870063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58946 + ... + 59298.

It is an arithmetic number, because the mean of its divisors is an integer number (1159704).

Almost surely, 2^20870066 is an apocalyptic number.

20870066 is a deficient number, since it is larger than the sum of its proper divisors (16240462).

20870066 is a wasteful number, since it uses less digits than its factorization.

20870066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20870066 is about 4568.3767357783. The cubic root of 20870066 is about 275.3222272461.

Adding to 20870066 its reverse (66007802), we get a palindrome (86877868).

The spelling of 20870066 in words is "twenty million, eight hundred seventy thousand, sixty-six".