20002100020 has 24 divisors (see below), whose sum is σ = 48005040384. Its totient is φ = 6857862816.

The previous prime is 20002100003. The next prime is 20002100021. The reversal of 20002100020 is 2000120002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 20002099976 and 20002100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002100021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71435932 + ... + 71436211.

It is an arithmetic number, because the mean of its divisors is an integer number (2000210016).

Almost surely, 2^20002100020 is an apocalyptic number.

20002100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002100020 is an abundant number, since it is smaller than the sum of its proper divisors (28002940364).

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

20002100020 is a wasteful number, since it uses less digits than its factorization.

20002100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142872159 (or 142872157 counting only the distinct ones).

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

Adding to 20002100020 its reverse (2000120002), we get a palindrome (22002220022).

The spelling of 20002100020 in words is "twenty billion, two million, one hundred thousand, twenty".