1020447840 has 48 divisors (see below), whose sum is σ = 3214412208. Its totient is φ = 272119296.

The previous prime is 1020447829. The next prime is 1020447871. The reversal of 1020447840 is 487440201.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1020447798 and 1020447807.

It is a congruent number.

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, 1062487 + ... + 1063446.

It is an arithmetic number, because the mean of its divisors is an integer number (66966921).

Almost surely, 2^1020447840 is an apocalyptic number.

1020447840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020447840 is an abundant number, since it is smaller than the sum of its proper divisors (2193964368).

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

1020447840 is a wasteful number, since it uses less digits than its factorization.

1020447840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125951 (or 2125943 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 1020447840 is about 31944.4492830914. The cubic root of 1020447840 is about 1006.7700101985.

The spelling of 1020447840 in words is "one billion, twenty million, four hundred forty-seven thousand, eight hundred forty".