1021020020 has 12 divisors (see below), whose sum is σ = 2144142084. Its totient is φ = 408408000.

The previous prime is 1021020019. The next prime is 1021020029. The reversal of 1021020020 is 200201201.

It can be written as a sum of positive squares in 2 ways, for example, as 701826064 + 319193956 = 26492^2 + 17866^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021020029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25525481 + ... + 25525520.

It is an arithmetic number, because the mean of its divisors is an integer number (178678507).

Almost surely, 2^1021020020 is an apocalyptic number.

1021020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021020020 is an abundant number, since it is smaller than the sum of its proper divisors (1123122064).

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

1021020020 is a wasteful number, since it uses less digits than its factorization.

1021020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51051010 (or 51051008 counting only the distinct ones).

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

The square root of 1021020020 is about 31953.4038875360. The cubic root of 1021020020 is about 1006.9581452533.

Adding to 1021020020 its reverse (200201201), we get a palindrome (1221221221).

The spelling of 1021020020 in words is "one billion, twenty-one million, twenty thousand, twenty".