20803139 has 16 divisors (see below), whose sum is σ = 25214976. Its totient is φ = 16783200.

The previous prime is 20803129. The next prime is 20803141. The reversal of 20803139 is 93130802.

It is not a de Polignac number, because 20803139 - 2¹² = 20799043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20803129) 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, 6734 + ... + 9324.

It is an arithmetic number, because the mean of its divisors is an integer number (1575936).

Almost surely, 2^20803139 is an apocalyptic number.

20803139 is a deficient number, since it is larger than the sum of its proper divisors (4411837).

20803139 is a wasteful number, since it uses less digits than its factorization.

20803139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20803139 is about 4561.0458230542. The cubic root of 20803139 is about 275.0276071458.

The spelling of 20803139 in words is "twenty million, eight hundred three thousand, one hundred thirty-nine".