20002121220 has 48 divisors (see below), whose sum is σ = 56032458048. Its totient is φ = 5331373440.

The previous prime is 20002121203. The next prime is 20002121231. The reversal of 20002121220 is 2212120002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20002121196 and 20002121205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50607 + ... + 206313.

It is an arithmetic number, because the mean of its divisors is an integer number (1167342876).

Almost surely, 2^20002121220 is an apocalyptic number.

20002121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002121220 is an abundant number, since it is smaller than the sum of its proper divisors (36030336828).

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

20002121220 is a wasteful number, since it uses less digits than its factorization.

20002121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157860 (or 157858 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20002121220 its reverse (2212120002), we get a palindrome (22214241222).

The spelling of 20002121220 in words is "twenty billion, two million, one hundred twenty-one thousand, two hundred twenty".