10021020 has 24 divisors (see below), whose sum is σ = 28059024. Its totient is φ = 2672256.

The previous prime is 10021003. The next prime is 10021027. The reversal of 10021020 is 2012001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83449 + ... + 83568.

It is an arithmetic number, because the mean of its divisors is an integer number (1169126).

Almost surely, 2^10021020 is an apocalyptic number.

10021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10021020 is an abundant number, since it is smaller than the sum of its proper divisors (18038004).

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

10021020 is a wasteful number, since it uses less digits than its factorization.

10021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167029 (or 167027 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 10021020 is about 3165.5994692949. The cubic root of 10021020 is about 215.5943174153.

Adding to 10021020 its reverse (2012001), we get a palindrome (12033021).

The spelling of 10021020 in words is "ten million, twenty-one thousand, twenty".