20001020020 has 24 divisors (see below), whose sum is σ = 42013374984. Its totient is φ = 7998268416.

The previous prime is 20001020003. The next prime is 20001020059. The reversal of 20001020020 is 2002010002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 143137296 + 19857882724 = 11964^2 + 140918^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20001019985 and 20001020012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55969 + ... + 207688.

It is an arithmetic number, because the mean of its divisors is an integer number (1750557291).

Almost surely, 2^20001020020 is an apocalyptic number.

20001020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001020020 is an abundant number, since it is smaller than the sum of its proper divisors (22012354964).

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

20001020020 is a wasteful number, since it uses less digits than its factorization.

20001020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267459 (or 267457 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 20001020020 its reverse (2002010002), we get a palindrome (22003030022).

The spelling of 20001020020 in words is "twenty billion, one million, twenty thousand, twenty".