20843379 has 16 divisors (see below), whose sum is σ = 30950400. Its totient is φ = 13863528.

The previous prime is 20843371. The next prime is 20843387. The reversal of 20843379 is 97334802.

It is an interprime number because it is at equal distance from previous prime (20843371) and next prime (20843387).

It is not a de Polignac number, because 20843379 - 2³ = 20843371 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20843371) 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, 19542 + ... + 20580.

It is an arithmetic number, because the mean of its divisors is an integer number (1934400).

Almost surely, 2^20843379 is an apocalyptic number.

20843379 is a deficient number, since it is larger than the sum of its proper divisors (10107021).

20843379 is a wasteful number, since it uses less digits than its factorization.

20843379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1785 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20843379 is about 4565.4549608993. The cubic root of 20843379 is about 275.2048237152.

The spelling of 20843379 in words is "twenty million, eight hundred forty-three thousand, three hundred seventy-nine".