20027661 has 8 divisors (see below), whose sum is σ = 27624480. Its totient is φ = 12891312.

The previous prime is 20027659. The next prime is 20027663. The reversal of 20027661 is 16672002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20027659) and next prime (20027663).

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

It is not a de Polignac number, because 20027661 - 2¹ = 20027659 is a prime.

It is a super-2 number, since 2×20027661² = 802214410261842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20027663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115015 + ... + 115188.

It is an arithmetic number, because the mean of its divisors is an integer number (3453060).

Almost surely, 2^20027661 is an apocalyptic number.

It is an amenable number.

20027661 is a deficient number, since it is larger than the sum of its proper divisors (7596819).

20027661 is a wasteful number, since it uses less digits than its factorization.

20027661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230235.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20027661 is about 4475.2274802517. The cubic root of 20027661 is about 271.5668431887.

Adding to 20027661 its reverse (16672002), we get a palindrome (36699663).

The spelling of 20027661 in words is "twenty million, twenty-seven thousand, six hundred sixty-one".