20251650 has 48 divisors (see below), whose sum is σ = 50889600. Its totient is φ = 5328960.

The previous prime is 20251643. The next prime is 20251669. The reversal of 20251650 is 5615202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10996 + ... + 12704.

It is an arithmetic number, because the mean of its divisors is an integer number (1060200).

Almost surely, 2^20251650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20251650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25444800).

20251650 is an abundant number, since it is smaller than the sum of its proper divisors (30637950).

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

20251650 is a wasteful number, since it uses less digits than its factorization.

20251650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20251650 is about 4500.1833295989. The cubic root of 20251650 is about 272.5754918077.

Adding to 20251650 its reverse (5615202), we get a palindrome (25866852).

It can be divided in two parts, 202516 and 50, that added together give a triangular number (202566 = T₆₃₆).

The spelling of 20251650 in words is "twenty million, two hundred fifty-one thousand, six hundred fifty".