20100111001020 has 36 divisors (see below), whose sum is σ = 60970336703640. Its totient is φ = 5360029600224.

The previous prime is 20100111000989. The next prime is 20100111001037. The reversal of 20100111001020 is 2010011100102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20100111000993 and 20100111001011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55833641490 + ... + 55833641849.

It is an arithmetic number, because the mean of its divisors is an integer number (1693620463990).

Almost surely, 2^{20100111001020} is an apocalyptic number.

20100111001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100111001020 is an abundant number, since it is smaller than the sum of its proper divisors (40870225702620).

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

20100111001020 is a wasteful number, since it uses less digits than its factorization.

20100111001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111667283354 (or 111667283349 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20100111001020 its reverse (2010011100102), we get a palindrome (22110122101122).

The spelling of 20100111001020 in words is "twenty trillion, one hundred billion, one hundred eleven million, one thousand, twenty".