20846840 has 32 divisors (see below), whose sum is σ = 53606880. Its totient is φ = 7147392.

The previous prime is 20846827. The next prime is 20846851. The reversal of 20846840 is 4864802.

It is a junction number, because it is equal to n+sod(n) for n = 20846797 and 20846806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36947 + ... + 37506.

It is an arithmetic number, because the mean of its divisors is an integer number (1675215).

Almost surely, 2^20846840 is an apocalyptic number.

20846840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20846840 is an abundant number, since it is smaller than the sum of its proper divisors (32760040).

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

20846840 is a wasteful number, since it uses less digits than its factorization.

20846840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74471 (or 74467 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 20846840 is about 4565.8339873456. The cubic root of 20846840 is about 275.2200552695.

The spelling of 20846840 in words is "twenty million, eight hundred forty-six thousand, eight hundred forty".