20150120 has 16 divisors (see below), whose sum is σ = 45337860. Its totient is φ = 8060032.

The previous prime is 20150111. The next prime is 20150131. The reversal of 20150120 is 2105102.

It can be written as a sum of positive squares in 2 ways, for example, as 19695844 + 454276 = 4438^2 + 674^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251837 + ... + 251916.

Almost surely, 2^20150120 is an apocalyptic number.

20150120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20150120 is an abundant number, since it is smaller than the sum of its proper divisors (25187740).

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

20150120 is a wasteful number, since it uses less digits than its factorization.

20150120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503764 (or 503760 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 20150120 is about 4488.8885038504. Note that the first 3 decimals coincide. The cubic root of 20150120 is about 272.1192167712.

Adding to 20150120 its reverse (2105102), we get a palindrome (22255222).

The spelling of 20150120 in words is "twenty million, one hundred fifty thousand, one hundred twenty".