20306406 has 16 divisors (see below), whose sum is σ = 41557824. Its totient is φ = 6611304.

The previous prime is 20306399. The next prime is 20306413. The reversal of 20306406 is 60460302.

It is an interprime number because it is at equal distance from previous prime (20306399) and next prime (20306413).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39096 + ... + 39611.

It is an arithmetic number, because the mean of its divisors is an integer number (2597364).

Almost surely, 2^20306406 is an apocalyptic number.

20306406 is an abundant number, since it is smaller than the sum of its proper divisors (21251418).

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

20306406 is a wasteful number, since it uses less digits than its factorization.

20306406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78755.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20306406 is about 4506.2629750160. The cubic root of 20306406 is about 272.8209320947.

Adding to 20306406 its reverse (60460302), we get a palindrome (80766708).

The spelling of 20306406 in words is "twenty million, three hundred six thousand, four hundred six".