201000100020 has 48 divisors (see below), whose sum is σ = 565324085760. Its totient is φ = 53359664256.

The previous prime is 201000100003. The next prime is 201000100039. The reversal of 201000100020 is 20001000102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 201000099981 and 201000100008.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7497835 + ... + 7524594.

It is an arithmetic number, because the mean of its divisors is an integer number (11777585120).

Almost surely, 2^201000100020 is an apocalyptic number.

201000100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201000100020 is an abundant number, since it is smaller than the sum of its proper divisors (364323985740).

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

201000100020 is a wasteful number, since it uses less digits than its factorization.

201000100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15022664 (or 15022662 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 201000100020 its reverse (20001000102), we get a palindrome (221001100122).

The spelling of 201000100020 in words is "two hundred one billion, one hundred thousand, twenty".