20705066 has 4 divisors (see below), whose sum is σ = 31057602. Its totient is φ = 10352532.

The previous prime is 20705053. The next prime is 20705071. The reversal of 20705066 is 66050702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 229441 = 4525^2 + 479^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5176265 + ... + 5176268.

Almost surely, 2^20705066 is an apocalyptic number.

20705066 is a deficient number, since it is larger than the sum of its proper divisors (10352536).

20705066 is a wasteful number, since it uses less digits than its factorization.

20705066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10352535.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20705066 is about 4550.2819692850. The cubic root of 20705066 is about 274.5947352903.

Adding to 20705066 its reverse (66050702), we get a palindrome (86755768).

The spelling of 20705066 in words is "twenty million, seven hundred five thousand, sixty-six".