20507850 has 96 divisors (see below), whose sum is σ = 61692480. Its totient is φ = 4968000.

The previous prime is 20507849. The next prime is 20507857. The reversal of 20507850 is 5870502.

It is a happy number.

It is a super-3 number, since 3×20507850³ (a number of 23 digits) contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20507857) 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 47 ways as a sum of consecutive naturals, for example, 14160 + ... + 15540.

It is an arithmetic number, because the mean of its divisors is an integer number (642630).

Almost surely, 2^20507850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20507850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30846240).

20507850 is an abundant number, since it is smaller than the sum of its proper divisors (41184630).

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

20507850 is a wasteful number, since it uses less digits than its factorization.

20507850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413 (or 1402 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 20507850 is about 4528.5593735757. The cubic root of 20507850 is about 273.7201130817.

The spelling of 20507850 in words is "twenty million, five hundred seven thousand, eight hundred fifty".