20210101020 has 72 divisors (see below), whose sum is σ = 63574505904. Its totient is φ = 5389358976.

The previous prime is 20210101001. The next prime is 20210101031. The reversal of 20210101020 is 2010101202.

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 = 20210100993 and 20210101011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2074369 + ... + 2084088.

Almost surely, 2^20210101020 is an apocalyptic number.

20210101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210101020 is an abundant number, since it is smaller than the sum of its proper divisors (43364404884).

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

20210101020 is a wasteful number, since it uses less digits than its factorization.

20210101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158481 (or 4158467 counting only the distinct ones).

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

Adding to 20210101020 its reverse (2010101202), we get a palindrome (22220202222).

The spelling of 20210101020 in words is "twenty billion, two hundred ten million, one hundred one thousand, twenty".