1020420456 has 32 divisors (see below), whose sum is σ = 2782965600. Its totient is φ = 309218240.

The previous prime is 1020420437. The next prime is 1020420463. The reversal of 1020420456 is 6540240201.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 1932351 + ... + 1932878.

It is an arithmetic number, because the mean of its divisors is an integer number (86967675).

Almost surely, 2^1020420456 is an apocalyptic number.

It is an amenable number.

1020420456 is an abundant number, since it is smaller than the sum of its proper divisors (1762545144).

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

1020420456 is a wasteful number, since it uses less digits than its factorization.

1020420456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865249 (or 3865245 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1020420456 is about 31944.0206611503. The cubic root of 1020420456 is about 1006.7610044674.

Adding to 1020420456 its reverse (6540240201), we get a palindrome (7560660657).

The spelling of 1020420456 in words is "one billion, twenty million, four hundred twenty thousand, four hundred fifty-six".