20101213020 has 96 divisors (see below), whose sum is σ = 67709376000. Its totient is φ = 4352742144.

The previous prime is 20101213019. The next prime is 20101213057. The reversal of 20101213020 is 2031210102.

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 = 20101212987 and 20101213005.

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, 1251495 + ... + 1267454.

It is an arithmetic number, because the mean of its divisors is an integer number (705306000).

Almost surely, 2^20101213020 is an apocalyptic number.

20101213020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101213020 is an abundant number, since it is smaller than the sum of its proper divisors (47608162980).

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

20101213020 is a wasteful number, since it uses less digits than its factorization.

20101213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518987 (or 2518985 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20101213020 its reverse (2031210102), we get a palindrome (22132423122).

The spelling of 20101213020 in words is "twenty billion, one hundred one million, two hundred thirteen thousand, twenty".