20356005 has 16 divisors (see below), whose sum is σ = 33105024. Its totient is φ = 10678080.

The previous prime is 20355961. The next prime is 20356013. The reversal of 20356005 is 50065302.

It is not a de Polignac number, because 20356005 - 2⁷ = 20355877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10209 + ... + 12038.

It is an arithmetic number, because the mean of its divisors is an integer number (2069064).

Almost surely, 2^20356005 is an apocalyptic number.

It is an amenable number.

20356005 is a deficient number, since it is larger than the sum of its proper divisors (12749019).

20356005 is a wasteful number, since it uses less digits than its factorization.

20356005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22316.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20356005 is about 4511.7629591990. The cubic root of 20356005 is about 273.0428759021.

The spelling of 20356005 in words is "twenty million, three hundred fifty-six thousand, five".