20015250 has 32 divisors (see below), whose sum is σ = 49959936. Its totient is φ = 5337200.

The previous prime is 20015231. The next prime is 20015251. The reversal of 20015250 is 5251002.

It is a super-2 number, since 2×20015250² = 801220465125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20015251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12594 + ... + 14093.

It is an arithmetic number, because the mean of its divisors is an integer number (1561248).

Almost surely, 2^20015250 is an apocalyptic number.

20015250 is an abundant number, since it is smaller than the sum of its proper divisors (29944686).

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

20015250 is a wasteful number, since it uses less digits than its factorization.

20015250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26707 (or 26697 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 20015250 is about 4473.8406319403. The cubic root of 20015250 is about 271.5107355793.

Adding to 20015250 its reverse (5251002), we get a palindrome (25266252).

The spelling of 20015250 in words is "twenty million, fifteen thousand, two hundred fifty".