20120201990 has 32 divisors (see below), whose sum is σ = 41406465600. Its totient is φ = 6895632384.

The previous prime is 20120201989. The next prime is 20120201999. The reversal of 20120201990 is 9910202102.

It is a happy number.

It is a super-3 number, since 3×20120201990³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120201999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126086 + ... + 236934.

It is an arithmetic number, because the mean of its divisors is an integer number (1293952050).

Almost surely, 2^20120201990 is an apocalyptic number.

20120201990 is an abundant number, since it is smaller than the sum of its proper divisors (21286263610).

20120201990 is a wasteful number, since it uses less digits than its factorization.

20120201990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113456.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 20120201990 in words is "twenty billion, one hundred twenty million, two hundred one thousand, nine hundred ninety".