20355969 has 8 divisors (see below), whose sum is σ = 27185472. Its totient is φ = 13548560.

The previous prime is 20355961. The next prime is 20356013. The reversal of 20355969 is 96955302.

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 20355969 - 2³ = 20355961 is a prime.

It is a super-2 number, since 2×20355969² = 828730947857922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20355961) 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, 3237 + ... + 7154.

It is an arithmetic number, because the mean of its divisors is an integer number (3398184).

Almost surely, 2^20355969 is an apocalyptic number.

It is an amenable number.

20355969 is a deficient number, since it is larger than the sum of its proper divisors (6829503).

20355969 is a wasteful number, since it uses less digits than its factorization.

20355969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11047.

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 20355969 is about 4511.7589696259. The cubic root of 20355969 is about 273.0427149414.

The spelling of 20355969 in words is "twenty million, three hundred fifty-five thousand, nine hundred sixty-nine".