20200155 has 16 divisors (see below), whose sum is σ = 32931360. Its totient is φ = 10569728.

The previous prime is 20200133. The next prime is 20200157. The reversal of 20200155 is 55100202.

It is a 11-Lehmer number, since φ(20200155) divides (20200155-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 20200155 - 2⁵ = 20200123 is a prime.

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 (20200157) 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, 11910 + ... + 13499.

It is an arithmetic number, because the mean of its divisors is an integer number (2058210).

Almost surely, 2^20200155 is an apocalyptic number.

20200155 is a deficient number, since it is larger than the sum of its proper divisors (12731205).

20200155 is a wasteful number, since it uses less digits than its factorization.

20200155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25470.

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

The square root of 20200155 is about 4494.4582543394. The cubic root of 20200155 is about 272.3442647434.

Adding to 20200155 its reverse (55100202), we get a palindrome (75300357).

The spelling of 20200155 in words is "twenty million, two hundred thousand, one hundred fifty-five".