20703891 has 8 divisors (see below), whose sum is σ = 29728720. Its totient is φ = 12740832.

The previous prime is 20703847. The next prime is 20703913. The reversal of 20703891 is 19830702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20703891 - 2⁷ = 20703763 is a prime.

It is a super-2 number, since 2×20703891² = 857302205079762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20703821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265396 + ... + 265473.

It is an arithmetic number, because the mean of its divisors is an integer number (3716090).

Almost surely, 2^20703891 is an apocalyptic number.

20703891 is a deficient number, since it is larger than the sum of its proper divisors (9024829).

20703891 is a wasteful number, since it uses less digits than its factorization.

20703891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530885.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20703891 is about 4550.1528545753. The cubic root of 20703891 is about 274.5895408302.

The spelling of 20703891 in words is "twenty million, seven hundred three thousand, eight hundred ninety-one".