20369905 has 8 divisors (see below), whose sum is σ = 24542784. Its totient is φ = 16230000.

The previous prime is 20369897. The next prime is 20369929. The reversal of 20369905 is 50996302.

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 20369905 - 2³ = 20369897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6861 + ... + 9370.

It is an arithmetic number, because the mean of its divisors is an integer number (3067848).

Almost surely, 2^20369905 is an apocalyptic number.

It is an amenable number.

20369905 is a deficient number, since it is larger than the sum of its proper divisors (4172879).

20369905 is a wasteful number, since it uses less digits than its factorization.

20369905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16487.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 20369905 is about 4513.3031141283. The cubic root of 20369905 is about 273.1050104325.

The spelling of 20369905 in words is "twenty million, three hundred sixty-nine thousand, nine hundred five".