20012020020 has 144 divisors (see below), whose sum is σ = 63047013120. Its totient is φ = 5134341888.

The previous prime is 20012020003. The next prime is 20012020051. The reversal of 20012020020 is 2002021002.

It is a super-3 number, since 3×20012020020³ (a number of 32 digits) contains 333 as substring.

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 = 20012019984 and 20012020011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 479094 + ... + 519186.

It is an arithmetic number, because the mean of its divisors is an integer number (437826480).

Almost surely, 2^20012020020 is an apocalyptic number.

20012020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31523506560).

20012020020 is an abundant number, since it is smaller than the sum of its proper divisors (43034993100).

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

20012020020 is a wasteful number, since it uses less digits than its factorization.

20012020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40214 (or 40209 counting only the distinct ones).

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

Adding to 20012020020 its reverse (2002021002), we get a palindrome (22014041022).

The spelling of 20012020020 in words is "twenty billion, twelve million, twenty thousand, twenty".