81675020 has 48 divisors (see below), whose sum is σ = 202789440. Its totient is φ = 27035904.

The previous prime is 81675007. The next prime is 81675023. The reversal of 81675020 is 2057618.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (81675023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5999 + ... + 14118.

It is an arithmetic number, because the mean of its divisors is an integer number (4224780).

Almost surely, 2^81675020 is an apocalyptic number.

It is an amenable number.

81675020 is an abundant number, since it is smaller than the sum of its proper divisors (121114420).

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

81675020 is a wasteful number, since it uses less digits than its factorization.

81675020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20162 (or 20160 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81675020 is about 9037.4233053454. The cubic root of 81675020 is about 433.8734579790.

The spelling of 81675020 in words is "eighty-one million, six hundred seventy-five thousand, twenty".