1020002020 has 24 divisors (see below), whose sum is σ = 2146423104. Its totient is φ = 407159136.

The previous prime is 1020002017. The next prime is 1020002041. The reversal of 1020002020 is 202000201.

It is a happy number.

It is a super-4 number, since 4×1020002020⁴ (a number of 37 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020001994 and 1020002012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42622 + ... + 62101.

It is an arithmetic number, because the mean of its divisors is an integer number (89434296).

Almost surely, 2^1020002020 is an apocalyptic number.

1020002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020002020 is an abundant number, since it is smaller than the sum of its proper divisors (1126421084).

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

1020002020 is a wasteful number, since it uses less digits than its factorization.

1020002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105219 (or 105217 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 1020002020 is about 31937.4704696537. The cubic root of 1020002020 is about 1006.6233740622.

Adding to 1020002020 its reverse (202000201), we get a palindrome (1222002221).

The spelling of 1020002020 in words is "one billion, twenty million, two thousand, twenty".