820021480 has 32 divisors (see below), whose sum is σ = 1846290600. Its totient is φ = 327787776.

The previous prime is 820021453. The next prime is 820021493. The reversal of 820021480 is 84120028.

It can be written as a sum of positive squares in 4 ways, for example, as 799645284 + 20376196 = 28278^2 + 4514^2 .

It is a super-2 number, since 2×820021480² = 1344870455322780800, which contains 22 as substring.

It is an unprimeable number.

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, 61666 + ... + 73774.

Almost surely, 2^820021480 is an apocalyptic number.

It is an amenable number.

820021480 is an abundant number, since it is smaller than the sum of its proper divisors (1026269120).

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

820021480 is a wasteful number, since it uses less digits than its factorization.

820021480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13813 (or 13809 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 820021480 is about 28636.0171811654. The cubic root of 820021480 is about 935.9983350349.

The spelling of 820021480 in words is "eight hundred twenty million, twenty-one thousand, four hundred eighty".