20789811 has 32 divisors (see below), whose sum is σ = 35412480. Its totient is φ = 11808288.

The previous prime is 20789801. The next prime is 20789843. The reversal of 20789811 is 11898702.

It is not a de Polignac number, because 20789811 - 2¹⁰ = 20788787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20789801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59740 + ... + 60086.

It is an arithmetic number, because the mean of its divisors is an integer number (1106640).

Almost surely, 2^20789811 is an apocalyptic number.

20789811 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20789811 is a deficient number, since it is larger than the sum of its proper divisors (14622669).

20789811 is a wasteful number, since it uses less digits than its factorization.

20789811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 20789811 is about 4559.5845205457. The cubic root of 20789811 is about 274.9688603859.

The spelling of 20789811 in words is "twenty million, seven hundred eighty-nine thousand, eight hundred eleven".