1005421020 has 48 divisors (see below), whose sum is σ = 2829502368. Its totient is φ = 266748160.

The previous prime is 1005421019. The next prime is 1005421037. The reversal of 1005421020 is 201245001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30711 + ... + 54350.

It is an arithmetic number, because the mean of its divisors is an integer number (58947966).

Almost surely, 2^1005421020 is an apocalyptic number.

1005421020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1005421020 is an abundant number, since it is smaller than the sum of its proper divisors (1824081348).

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

1005421020 is a wasteful number, since it uses less digits than its factorization.

1005421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85270 (or 85268 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1005421020 is about 31708.3746035649. The cubic root of 1005421020 is about 1001.8037511921.

Adding to 1005421020 its reverse (201245001), we get a palindrome (1206666021).

The spelling of 1005421020 in words is "one billion, five million, four hundred twenty-one thousand, twenty".