1023001020 has 72 divisors (see below), whose sum is σ = 3142426560. Its totient is φ = 269343360.

The previous prime is 1023001009. The next prime is 1023001033. The reversal of 1023001020 is 201003201.

It is a happy number.

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 = 1023000993 and 1023001011.

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, 21751 + ... + 50190.

Almost surely, 2^1023001020 is an apocalyptic number.

1023001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1023001020 is an abundant number, since it is smaller than the sum of its proper divisors (2119425540).

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

1023001020 is a wasteful number, since it uses less digits than its factorization.

1023001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72035 (or 72030 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1023001020 is about 31984.3871287227. The cubic root of 1023001020 is about 1007.6089634975.

Adding to 1023001020 its reverse (201003201), we get a palindrome (1224004221).

The spelling of 1023001020 in words is "one billion, twenty-three million, one thousand, twenty".