20100100020 has 192 divisors, whose sum is σ = 75565357056. Its totient is φ = 3855352320.

The previous prime is 20100099997. The next prime is 20100100037. The reversal of 20100100020 is 2000100102.

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 = 20100099981 and 20100100008.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 107274 + ... + 227393.

It is an arithmetic number, because the mean of its divisors is an integer number (393569568).

Almost surely, 2^20100100020 is an apocalyptic number.

20100100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100100020 is an abundant number, since it is smaller than the sum of its proper divisors (55465257036).

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

20100100020 is a wasteful number, since it uses less digits than its factorization.

20100100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334710 (or 334708 counting only the distinct ones).

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

Adding to 20100100020 its reverse (2000100102), we get a palindrome (22100200122).

The spelling of 20100100020 in words is "twenty billion, one hundred million, one hundred thousand, twenty".