20850030 has 96 divisors (see below), whose sum is σ = 58125600. Its totient is φ = 5170176.

The previous prime is 20850019. The next prime is 20850047. The reversal of 20850030 is 3005802.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20849985 and 20850012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152122 + ... + 152258.

It is an arithmetic number, because the mean of its divisors is an integer number (605475).

Almost surely, 2^20850030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20850030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29062800).

20850030 is an abundant number, since it is smaller than the sum of its proper divisors (37275570).

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

20850030 is a wasteful number, since it uses less digits than its factorization.

20850030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20850030 is about 4566.1833077528. The cubic root of 20850030 is about 275.2340926840.

Adding to 20850030 its reverse (3005802), we get a palindrome (23855832).

The spelling of 20850030 in words is "twenty million, eight hundred fifty thousand, thirty".