81020246 has 4 divisors (see below), whose sum is σ = 121530372. Its totient is φ = 40510122.

The previous prime is 81020239. The next prime is 81020273. The reversal of 81020246 is 64202018.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20255060 + ... + 20255063.

It is an arithmetic number, because the mean of its divisors is an integer number (30382593).

Almost surely, 2^81020246 is an apocalyptic number.

81020246 is a deficient number, since it is larger than the sum of its proper divisors (40510126).

81020246 is a wasteful number, since it uses less digits than its factorization.

81020246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40510125.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81020246 is about 9001.1247075018. The cubic root of 81020246 is about 432.7109172062.

The spelling of 81020246 in words is "eighty-one million, twenty thousand, two hundred forty-six".