1031210020 has 24 divisors (see below), whose sum is σ = 2166301368. Its totient is φ = 412339200.

The previous prime is 1031209997. The next prime is 1031210027. The reversal of 1031210020 is 200121301.

It can be written as a sum of positive squares in 4 ways, for example, as 243172836 + 788037184 = 15594^2 + 28072^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1031209979 and 1031210006.

It is not an unprimeable number, because it can be changed into a prime (1031210027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63540 + ... + 78100.

It is an arithmetic number, because the mean of its divisors is an integer number (90262557).

Almost surely, 2^1031210020 is an apocalyptic number.

1031210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031210020 is an abundant number, since it is smaller than the sum of its proper divisors (1135091348).

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

1031210020 is a wasteful number, since it uses less digits than its factorization.

1031210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18111 (or 18109 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1031210020 is about 32112.4589528737. The cubic root of 1031210020 is about 1010.2969489241.

Adding to 1031210020 its reverse (200121301), we get a palindrome (1231331321).

The spelling of 1031210020 in words is "one billion, thirty-one million, two hundred ten thousand, twenty".