20150000 has 120 divisors (see below), whose sum is σ = 54246528. Its totient is φ = 7200000.

The previous prime is 20149973. The next prime is 20150021. The reversal of 20150000 is 5102.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20150000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649985 + ... + 650015.

Almost surely, 2^20150000 is an apocalyptic number.

20150000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20150000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27123264).

20150000 is an abundant number, since it is smaller than the sum of its proper divisors (34096528).

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

20150000 is an equidigital number, since it uses as much as digits as its factorization.

20150000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 20150000 is about 4488.8751374927. The cubic root of 20150000 is about 272.1186765863.

Adding to 20150000 its reverse (5102), we get a palindrome (20155102).

The spelling of 20150000 in words is "twenty million, one hundred fifty thousand".