20120101020 has 36 divisors (see below), whose sum is σ = 61030973640. Its totient is φ = 5365360224.

The previous prime is 20120100953. The next prime is 20120101031. The reversal of 20120101020 is 2010102102.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 20120100993 and 20120101011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55888990 + ... + 55889349.

Almost surely, 2^20120101020 is an apocalyptic number.

20120101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120101020 is an abundant number, since it is smaller than the sum of its proper divisors (40910872620).

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

20120101020 is a wasteful number, since it uses less digits than its factorization.

20120101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111778354 (or 111778349 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20120101020 its reverse (2010102102), we get a palindrome (22130203122).

The spelling of 20120101020 in words is "twenty billion, one hundred twenty million, one hundred one thousand, twenty".