20402843 has 8 divisors (see below), whose sum is σ = 20779200. Its totient is φ = 20029248.

The previous prime is 20402831. The next prime is 20402861. The reversal of 20402843 is 34820402.

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

It is a cyclic number.

It is not a de Polignac number, because 20402843 - 2¹⁴ = 20386459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402803) 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, 19118 + ... + 20156.

It is an arithmetic number, because the mean of its divisors is an integer number (2597400).

Almost surely, 2^20402843 is an apocalyptic number.

20402843 is a deficient number, since it is larger than the sum of its proper divisors (376357).

20402843 is a wasteful number, since it uses less digits than its factorization.

20402843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20402843 is about 4516.9506306800. The cubic root of 20402843 is about 273.2521341527.

The spelling of 20402843 in words is "twenty million, four hundred two thousand, eight hundred forty-three".