81914020 has 24 divisors (see below), whose sum is σ = 173081664. Its totient is φ = 32563296.

The previous prime is 81913969. The next prime is 81914057. The reversal of 81914020 is 2041918.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9304 + ... + 15823.

It is an arithmetic number, because the mean of its divisors is an integer number (7211736).

Almost surely, 2^81914020 is an apocalyptic number.

It is an amenable number.

81914020 is an abundant number, since it is smaller than the sum of its proper divisors (91167644).

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

81914020 is a wasteful number, since it uses less digits than its factorization.

81914020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25299 (or 25297 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 81914020 is about 9050.6364417095. The cubic root of 81914020 is about 434.2962505482.

Adding to 81914020 its reverse (2041918), we get a palindrome (83955938).

The spelling of 81914020 in words is "eighty-one million, nine hundred fourteen thousand, twenty".