20740666 has 16 divisors (see below), whose sum is σ = 33060960. Its totient is φ = 9730800.

The previous prime is 20740633. The next prime is 20740673. The reversal of 20740666 is 66604702.

20740666 is nontrivially palindromic in base 14.

It is a super-2 number, since 2×20740666² = 860350452247112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1516 + ... + 6616.

It is an arithmetic number, because the mean of its divisors is an integer number (2066310).

Almost surely, 2^20740666 is an apocalyptic number.

20740666 is a deficient number, since it is larger than the sum of its proper divisors (12320294).

20740666 is a wasteful number, since it uses less digits than its factorization.

20740666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5229.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20740666 is about 4554.1921347260. The cubic root of 20740666 is about 274.7520232903.

The spelling of 20740666 in words is "twenty million, seven hundred forty thousand, six hundred sixty-six".