20821095 has 24 divisors (see below), whose sum is σ = 37660896. Its totient is φ = 10621248.

The previous prime is 20821081. The next prime is 20821117. The reversal of 20821095 is 59012802.

It is not a de Polignac number, because 20821095 - 2⁴ = 20821079 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9024 + ... + 11093.

It is an arithmetic number, because the mean of its divisors is an integer number (1569204).

Almost surely, 2^20821095 is an apocalyptic number.

20821095 is a deficient number, since it is larger than the sum of its proper divisors (16839801).

20821095 is a wasteful number, since it uses less digits than its factorization.

20821095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20151 (or 20148 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20821095 is about 4563.0138066852. The cubic root of 20821095 is about 275.1067134056.

Adding to 20821095 its reverse (59012802), we get a palindrome (79833897).

The spelling of 20821095 in words is "twenty million, eight hundred twenty-one thousand, ninety-five".