20506366 has 4 divisors (see below), whose sum is σ = 30759552. Its totient is φ = 10253182.

The previous prime is 20506351. The next prime is 20506391. The reversal of 20506366 is 66360502.

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

It is a super-2 number, since 2×20506366² = 841022093051912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5126590 + ... + 5126593.

It is an arithmetic number, because the mean of its divisors is an integer number (7689888).

Almost surely, 2^20506366 is an apocalyptic number.

20506366 is a deficient number, since it is larger than the sum of its proper divisors (10253186).

20506366 is a wasteful number, since it uses less digits than its factorization.

20506366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10253185.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 20506366 is about 4528.3955215948. The cubic root of 20506366 is about 273.7135105621.

Adding to 20506366 its reverse (66360502), we get a palindrome (86866868).

The spelling of 20506366 in words is "twenty million, five hundred six thousand, three hundred sixty-six".