20845620 has 48 divisors (see below), whose sum is σ = 64854720. Its totient is φ = 5558688.

The previous prime is 20845579. The next prime is 20845631. The reversal of 20845620 is 2654802.

20845620 is a `hidden beast` number, since 20 + 84 + 562 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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, 18762 + ... + 19841.

It is an arithmetic number, because the mean of its divisors is an integer number (1351140).

Almost surely, 2^20845620 is an apocalyptic number.

20845620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20845620 is an abundant number, since it is smaller than the sum of its proper divisors (44009100).

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

20845620 is a wasteful number, since it uses less digits than its factorization.

20845620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38621 (or 38613 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20845620 is about 4565.7003843879. The cubic root of 20845620 is about 275.2146863500.

The spelling of 20845620 in words is "twenty million, eight hundred forty-five thousand, six hundred twenty".