80205720 has 64 divisors (see below), whose sum is σ = 274993920. Its totient is φ = 18332544.

The previous prime is 80205679. The next prime is 80205731. The reversal of 80205720 is 2750208.

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

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, 46902 + ... + 48581.

It is an arithmetic number, because the mean of its divisors is an integer number (4296780).

Almost surely, 2^80205720 is an apocalyptic number.

It is an amenable number.

80205720 is an abundant number, since it is smaller than the sum of its proper divisors (194788200).

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

80205720 is a wasteful number, since it uses less digits than its factorization.

80205720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95504 (or 95500 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 80205720 is about 8955.7646239727. The cubic root of 80205720 is about 431.2559637907.

Adding to 80205720 its reverse (2750208), we get a palindrome (82955928).

The spelling of 80205720 in words is "eighty million, two hundred five thousand, seven hundred twenty".