820786446 has 24 divisors (see below), whose sum is σ = 1844237304. Its totient is φ = 273595320.

The previous prime is 820786433. The next prime is 820786471. The reversal of 820786446 is 644687028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 843945 + ... + 844916.

It is an arithmetic number, because the mean of its divisors is an integer number (76843221).

Almost surely, 2^820786446 is an apocalyptic number.

820786446 is an abundant number, since it is smaller than the sum of its proper divisors (1023450858).

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

820786446 is a wasteful number, since it uses less digits than its factorization.

820786446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688878 (or 1688866 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 820786446 is about 28649.3707784307. The cubic root of 820786446 is about 936.2892966703.

The spelling of 820786446 in words is "eight hundred twenty million, seven hundred eighty-six thousand, four hundred forty-six".