20120201138 has 16 divisors (see below), whose sum is σ = 30619088640. Its totient is φ = 9914706816.

The previous prime is 20120201137. The next prime is 20120201149. The reversal of 20120201138 is 83110202102.

It is not an unprimeable number, because it can be changed into a prime (20120201137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170606 + ... + 263337.

It is an arithmetic number, because the mean of its divisors is an integer number (1913693040).

Almost surely, 2^20120201138 is an apocalyptic number.

20120201138 is a deficient number, since it is larger than the sum of its proper divisors (10498887502).

20120201138 is a wasteful number, since it uses less digits than its factorization.

20120201138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434281.

The product of its (nonzero) digits is 192, while the sum is 20.

The spelling of 20120201138 in words is "twenty billion, one hundred twenty million, two hundred one thousand, one hundred thirty-eight".