20885340 has 48 divisors (see below), whose sum is σ = 66834432. Its totient is φ = 4773696.

The previous prime is 20885323. The next prime is 20885341. The reversal of 20885340 is 4358802.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20885298 and 20885307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20885341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24444 + ... + 25283.

It is an arithmetic number, because the mean of its divisors is an integer number (1392384).

Almost surely, 2^20885340 is an apocalyptic number.

20885340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20885340 is an abundant number, since it is smaller than the sum of its proper divisors (45949092).

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

20885340 is a wasteful number, since it uses less digits than its factorization.

20885340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49746 (or 49744 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20885340 is about 4570.0481397902. The cubic root of 20885340 is about 275.3893767898.

The spelling of 20885340 in words is "twenty million, eight hundred eighty-five thousand, three hundred forty".