20850520 has 32 divisors (see below), whose sum is σ = 47070720. Its totient is φ = 8312320.

The previous prime is 20850491. The next prime is 20850521. The reversal of 20850520 is 2505802.

It is a junction number, because it is equal to n+sod(n) for n = 20850491 and 20850500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20850521) by changing a digit.

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, 14640 + ... + 16000.

It is an arithmetic number, because the mean of its divisors is an integer number (1470960).

Almost surely, 2^20850520 is an apocalyptic number.

20850520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20850520 is an abundant number, since it is smaller than the sum of its proper divisors (26220200).

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

20850520 is a wasteful number, since it uses less digits than its factorization.

20850520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 20850520 is about 4566.2369627517. The cubic root of 20850520 is about 275.2362487744.

The spelling of 20850520 in words is "twenty million, eight hundred fifty thousand, five hundred twenty".