20261250 has 60 divisors (see below), whose sum is σ = 54887118. Its totient is φ = 5400000.

The previous prime is 20261231. The next prime is 20261261. The reversal of 20261250 is 5216202.

20261250 is a `hidden beast` number, since 2 + 0 + 2 + 612 + 50 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 199809 + 20061441 = 447^2 + 4479^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 10350 + ... + 12150.

Almost surely, 2^20261250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20261250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27443559).

20261250 is an abundant number, since it is smaller than the sum of its proper divisors (34625868).

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

20261250 is a wasteful number, since it uses less digits than its factorization.

20261250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829 (or 1811 counting only the distinct ones).

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

The square root of 20261250 is about 4501.2498264371. The cubic root of 20261250 is about 272.6185551524.

Adding to 20261250 its reverse (5216202), we get a palindrome (25477452).

The spelling of 20261250 in words is "twenty million, two hundred sixty-one thousand, two hundred fifty".