20506386 has 32 divisors (see below), whose sum is σ = 45318528. Its totient is φ = 6152960.

The previous prime is 20506351. The next prime is 20506391. The reversal of 20506386 is 68360502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2025 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (1416204).

Almost surely, 2^20506386 is an apocalyptic number.

20506386 is an abundant number, since it is smaller than the sum of its proper divisors (24812142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20506386 is a wasteful number, since it uses less digits than its factorization.

20506386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8786.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20506386 is about 4528.3977298820. The cubic root of 20506386 is about 273.7135995470.

Adding to 20506386 its reverse (68360502), we get a palindrome (88866888).

The spelling of 20506386 in words is "twenty million, five hundred six thousand, three hundred eighty-six".