200120101820 has 12 divisors (see below), whose sum is σ = 420252213864. Its totient is φ = 80048040720.

The previous prime is 200120101799. The next prime is 200120101921. The reversal of 200120101820 is 28101021002.

It is a happy number.

It is a congruent number.

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, 5003002526 + ... + 5003002565.

It is an arithmetic number, because the mean of its divisors is an integer number (35021017822).

Almost surely, 2^200120101820 is an apocalyptic number.

200120101820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200120101820 is an abundant number, since it is smaller than the sum of its proper divisors (220132112044).

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

200120101820 is a wasteful number, since it uses less digits than its factorization.

200120101820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006005100 (or 10006005098 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 200120101820 its reverse (28101021002), we get a palindrome (228221122822).

The spelling of 200120101820 in words is "two hundred billion, one hundred twenty million, one hundred one thousand, eight hundred twenty".