100401002020 has 48 divisors (see below), whose sum is σ = 233249175936. Its totient is φ = 35995232000.

The previous prime is 100401001991. The next prime is 100401002021. The reversal of 100401002020 is 20200104001.

It is a super-2 number, since 2×100401002020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 100401001988 and 100401002006.

It is not an unprimeable number, because it can be changed into a prime (100401002021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3198241 + ... + 3229480.

It is an arithmetic number, because the mean of its divisors is an integer number (4859357832).

Almost surely, 2^100401002020 is an apocalyptic number.

100401002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100401002020 is an abundant number, since it is smaller than the sum of its proper divisors (132848173916).

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

100401002020 is a wasteful number, since it uses less digits than its factorization.

100401002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6427812 (or 6427810 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 100401002020 its reverse (20200104001), we get a palindrome (120601106021).

The spelling of 100401002020 in words is "one hundred billion, four hundred one million, two thousand, twenty".