20737666 has 8 divisors (see below), whose sum is σ = 31140864. Its totient is φ = 10357380.

The previous prime is 20737663. The next prime is 20737679. The reversal of 20737666 is 66673702.

It is a happy number.

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

It is a super-2 number, since 2×20737666² = 860101582255112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20737663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3250 + ... + 7213.

It is an arithmetic number, because the mean of its divisors is an integer number (3892608).

Almost surely, 2^20737666 is an apocalyptic number.

20737666 is a deficient number, since it is larger than the sum of its proper divisors (10403198).

20737666 is a wasteful number, since it uses less digits than its factorization.

20737666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11456.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 20737666 is about 4553.8627559469. The cubic root of 20737666 is about 274.7387756312.

It can be divided in two parts, 207 and 37666, that added together give a palindrome (37873).

The spelling of 20737666 in words is "twenty million, seven hundred thirty-seven thousand, six hundred sixty-six".