20102566 has 8 divisors (see below), whose sum is σ = 32895144. Its totient is φ = 9137520.

The previous prime is 20102527. The next prime is 20102567. The reversal of 20102566 is 66520102.

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

It is a super-2 number, since 2×20102566² = 808226319568712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 913753 = 20102566 / (2 + 0 + 1 + 0 + 2 + 5 + 6 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102567) 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, 456855 + ... + 456898.

It is an arithmetic number, because the mean of its divisors is an integer number (4111893).

Almost surely, 2^20102566 is an apocalyptic number.

20102566 is a deficient number, since it is larger than the sum of its proper divisors (12792578).

20102566 is a wasteful number, since it uses less digits than its factorization.

20102566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913766.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20102566 is about 4483.5885181404. The cubic root of 20102566 is about 271.9049823102.

Adding to 20102566 its reverse (66520102), we get a palindrome (86622668).

The spelling of 20102566 in words is "twenty million, one hundred two thousand, five hundred sixty-six".