20850420 has 96 divisors (see below), whose sum is σ = 63141120. Its totient is φ = 5125120.

The previous prime is 20850409. The next prime is 20850437. The reversal of 20850420 is 2405802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39760 + ... + 40280.

It is an arithmetic number, because the mean of its divisors is an integer number (657720).

Almost surely, 2^20850420 is an apocalyptic number.

20850420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20850420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31570560).

20850420 is an abundant number, since it is smaller than the sum of its proper divisors (42290700).

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

20850420 is a wasteful number, since it uses less digits than its factorization.

20850420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 20850420 is about 4566.2260128031. The cubic root of 20850420 is about 275.2358087587.

The spelling of 20850420 in words is "twenty million, eight hundred fifty thousand, four hundred twenty".