20002120020 has 96 divisors (see below), whose sum is σ = 62833155840. Its totient is φ = 5282098560.

The previous prime is 20002120001. The next prime is 20002120121. The reversal of 20002120020 is 2002120002.

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 = 20002119984 and 20002120011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124191 + ... + 235430.

It is an arithmetic number, because the mean of its divisors is an integer number (654512040).

Almost surely, 2^20002120020 is an apocalyptic number.

20002120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002120020 is an abundant number, since it is smaller than the sum of its proper divisors (42831035820).

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

20002120020 is a wasteful number, since it uses less digits than its factorization.

20002120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359742 (or 359734 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20002120020 its reverse (2002120002), we get a palindrome (22004240022).

The spelling of 20002120020 in words is "twenty billion, two million, one hundred twenty thousand, twenty".