20308486 has 32 divisors (see below), whose sum is σ = 34774560. Its totient is φ = 8812800.

The previous prime is 20308481. The next prime is 20308499. The reversal of 20308486 is 68480302.

It is a happy number.

It is a super-2 number, since 2×20308486² = 824869207224392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20308481) 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 15 ways as a sum of consecutive naturals, for example, 49450 + ... + 49858.

It is an arithmetic number, because the mean of its divisors is an integer number (1086705).

Almost surely, 2^20308486 is an apocalyptic number.

20308486 is a deficient number, since it is larger than the sum of its proper divisors (14466074).

20308486 is a wasteful number, since it uses less digits than its factorization.

20308486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20308486 is about 4506.4937590104. The cubic root of 20308486 is about 272.8302468591.

Adding to 20308486 its reverse (68480302), we get a palindrome (88788788).

The spelling of 20308486 in words is "twenty million, three hundred eight thousand, four hundred eighty-six".