820507354394 has 32 divisors (see below), whose sum is σ = 1563646780416. Its totient is φ = 314125464960.

The previous prime is 820507354367. The next prime is 820507354399. The reversal of 820507354394 is 493453705028.

It is a super-2 number, since 2×820507354394² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (820507354399) 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, 72708587 + ... + 72719870.

It is an arithmetic number, because the mean of its divisors is an integer number (48863961888).

Almost surely, 2^820507354394 is an apocalyptic number.

820507354394 is a deficient number, since it is larger than the sum of its proper divisors (743139426022).

820507354394 is a wasteful number, since it uses less digits than its factorization.

820507354394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145428510.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 820507354394 in words is "eight hundred twenty billion, five hundred seven million, three hundred fifty-four thousand, three hundred ninety-four".