82020681 has 10 divisors (see below), whose sum is σ = 122524842. Its totient is φ = 54680400.

The previous prime is 82020649. The next prime is 82020707. The reversal of 82020681 is 18602028.

It can be written as a sum of positive squares in only one way, i.e., 77158656 + 4862025 = 8784^2 + 2205^2 .

It is not a de Polignac number, because 82020681 - 2⁵ = 82020649 is a prime.

It is a super-2 number, since 2×82020681² = 13454784223407522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (82020641) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 506220 + ... + 506381.

Almost surely, 2^82020681 is an apocalyptic number.

82020681 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

82020681 is a deficient number, since it is larger than the sum of its proper divisors (40504161).

82020681 is a wasteful number, since it uses less digits than its factorization.

82020681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012613 (or 1012604 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 82020681 is about 9056.5269833419. The cubic root of 82020681 is about 434.4846691741.

The spelling of 82020681 in words is "eighty-two million, twenty thousand, six hundred eighty-one".