82120220 has 48 divisors (see below), whose sum is σ = 212253888. Its totient is φ = 25989120.

The previous prime is 82120219. The next prime is 82120231. The reversal of 82120220 is 2202128.

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, 20741 + ... + 24380.

It is an arithmetic number, because the mean of its divisors is an integer number (4421956).

Almost surely, 2^82120220 is an apocalyptic number.

It is an amenable number.

82120220 is an abundant number, since it is smaller than the sum of its proper divisors (130133668).

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

82120220 is a wasteful number, since it uses less digits than its factorization.

82120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45150 (or 45148 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 82120220 is about 9062.0207459484. The cubic root of 82120220 is about 434.6603593604.

Adding to 82120220 its reverse (2202128), we get a palindrome (84322348).

The spelling of 82120220 in words is "eighty-two million, one hundred twenty thousand, two hundred twenty".