20809703 has 6 divisors (see below), whose sum is σ = 20993784. Its totient is φ = 20626496.

The previous prime is 20809699. The next prime is 20809709. The reversal of 20809703 is 30790802.

It is not a de Polignac number, because 20809703 - 2² = 20809699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20809709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58775 + ... + 59127.

It is an arithmetic number, because the mean of its divisors is an integer number (3498964).

Almost surely, 2^20809703 is an apocalyptic number.

20809703 is a deficient number, since it is larger than the sum of its proper divisors (184081).

20809703 is an frugal number, since it uses more digits than its factorization.

20809703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20809703 is about 4561.7653381120. The cubic root of 20809703 is about 275.0565305272.

It can be divided in two parts, 20809 and 703, that added together give a palindrome (21512).

The spelling of 20809703 in words is "twenty million, eight hundred nine thousand, seven hundred three".