20120188 has 12 divisors (see below), whose sum is σ = 38411352. Its totient is φ = 9145520.

The previous prime is 20120161. The next prime is 20120189. The reversal of 20120188 is 88102102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228595 + ... + 228682.

It is an arithmetic number, because the mean of its divisors is an integer number (3200946).

Almost surely, 2^20120188 is an apocalyptic number.

It is an amenable number.

20120188 is a deficient number, since it is larger than the sum of its proper divisors (18291164).

20120188 is a wasteful number, since it uses less digits than its factorization.

20120188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457292 (or 457290 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20120188 is about 4485.5532546164. The cubic root of 20120188 is about 271.9844101503.

It can be divided in two parts, 2012018 and 8, that multiplied together give a square (16096144 = 4012²).

The spelling of 20120188 in words is "twenty million, one hundred twenty thousand, one hundred eighty-eight".