20806620 has 48 divisors (see below), whose sum is σ = 58456608. Its totient is φ = 5529600.

The previous prime is 20806619. The next prime is 20806631. The reversal of 20806620 is 2660802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34320 + ... + 34920.

It is an arithmetic number, because the mean of its divisors is an integer number (1217846).

Almost surely, 2^20806620 is an apocalyptic number.

20806620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20806620 is an abundant number, since it is smaller than the sum of its proper divisors (37649988).

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

20806620 is a wasteful number, since it uses less digits than its factorization.

20806620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20806620 is about 4561.4274081695. The cubic root of 20806620 is about 275.0429464608.

The spelling of 20806620 in words is "twenty million, eight hundred six thousand, six hundred twenty".