820894411 has 4 divisors (see below), whose sum is σ = 864099400. Its totient is φ = 777689424.

The previous prime is 820894409. The next prime is 820894423. The reversal of 820894411 is 114498028.

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

It is a cyclic number.

It is not a de Polignac number, because 820894411 - 2¹ = 820894409 is a prime.

It is a super-2 number, since 2×820894411² = 1347735268022073842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820894471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21602466 + ... + 21602503.

It is an arithmetic number, because the mean of its divisors is an integer number (216024850).

Almost surely, 2^820894411 is an apocalyptic number.

820894411 is a deficient number, since it is larger than the sum of its proper divisors (43204989).

820894411 is a wasteful number, since it uses less digits than its factorization.

820894411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43204988.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 820894411 is about 28651.2549637882. The cubic root of 820894411 is about 936.3303475602.

The spelling of 820894411 in words is "eight hundred twenty million, eight hundred ninety-four thousand, four hundred eleven".