1002020023 has 4 divisors (see below), whose sum is σ = 1003943808. Its totient is φ = 1000096240.

The previous prime is 1002020017. The next prime is 1002020027. The reversal of 1002020023 is 3200202001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002020023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002019991 and 1002020009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002020027) 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, 961111 + ... + 962152.

It is an arithmetic number, because the mean of its divisors is an integer number (250985952).

Almost surely, 2^1002020023 is an apocalyptic number.

1002020023 is a deficient number, since it is larger than the sum of its proper divisors (1923785).

1002020023 is an equidigital number, since it uses as much as digits as its factorization.

1002020023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923784.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 1002020023 is about 31654.6998564194. The cubic root of 1002020023 is about 1000.6728881200.

Adding to 1002020023 its reverse (3200202001), we get a palindrome (4202222024).

The spelling of 1002020023 in words is "one billion, two million, twenty thousand, twenty-three".