20920066 has 8 divisors (see below), whose sum is σ = 31517820. Its totient is φ = 10414128.

The previous prime is 20920061. The next prime is 20920091. The reversal of 20920066 is 66002902.

It can be written as a sum of positive squares in 2 ways, for example, as 16232841 + 4687225 = 4029^2 + 2165^2 .

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

It is a super-2 number, since 2×20920066² = 875298322888712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20920066.

It is not an unprimeable number, because it can be changed into a prime (20920061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22381 + ... + 23296.

Almost surely, 2^20920066 is an apocalyptic number.

20920066 is a deficient number, since it is larger than the sum of its proper divisors (10597754).

20920066 is a wasteful number, since it uses less digits than its factorization.

20920066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45908.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20920066 is about 4573.8458653523. The cubic root of 20920066 is about 275.5419220068.

Adding to 20920066 its reverse (66002902), we get a palindrome (86922968).

The spelling of 20920066 in words is "twenty million, nine hundred twenty thousand, sixty-six".