8445203820 has 72 divisors (see below), whose sum is σ = 25633752144. Its totient is φ = 2250592128.

The previous prime is 8445203797. The next prime is 8445203831. The reversal of 8445203820 is 283025448.

8445203820 is a `hidden beast` number, since 8 + 445 + 203 + 8 + 2 + 0 = 666.

It is a super-2 number, since 2×8445203820² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278442 + ... + 307278.

Almost surely, 2^8445203820 is an apocalyptic number.

It is an amenable number.

8445203820 is an abundant number, since it is smaller than the sum of its proper divisors (17188548324).

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

8445203820 is a wasteful number, since it uses less digits than its factorization.

8445203820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30479 (or 30474 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 36.

The square root of 8445203820 is about 91897.7900713613. The cubic root of 8445203820 is about 2036.4326205529.

The spelling of 8445203820 in words is "eight billion, four hundred forty-five million, two hundred three thousand, eight hundred twenty".