20145850 has 48 divisors (see below), whose sum is σ = 40196088. Its totient is φ = 7485440.

The previous prime is 20145847. The next prime is 20145857. The reversal of 20145850 is 5854102.

It can be written as a sum of positive squares in 12 ways, for example, as 8014561 + 12131289 = 2831^2 + 3483^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20145857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116364 + ... + 116536.

Almost surely, 2^20145850 is an apocalyptic number.

20145850 is a deficient number, since it is larger than the sum of its proper divisors (20050238).

20145850 is a wasteful number, since it uses less digits than its factorization.

20145850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 20145850 is about 4488.4128597980. The cubic root of 20145850 is about 272.0999938725.

Adding to 20145850 its reverse (5854102), we get a palindrome (25999952).

The spelling of 20145850 in words is "twenty million, one hundred forty-five thousand, eight hundred fifty".