20417913 has 20 divisors (see below), whose sum is σ = 32108560. Its totient is φ = 12894552.

The previous prime is 20417909. The next prime is 20417923. The reversal of 20417913 is 31971402.

It is not a de Polignac number, because 20417913 - 2² = 20417909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20417923) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5095 + ... + 8172.

It is an arithmetic number, because the mean of its divisors is an integer number (1605428).

Almost surely, 2^20417913 is an apocalyptic number.

It is an amenable number.

20417913 is a deficient number, since it is larger than the sum of its proper divisors (11690647).

20417913 is a wasteful number, since it uses less digits than its factorization.

20417913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13298 (or 13289 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20417913 is about 4518.6184835633. The cubic root of 20417913 is about 273.3193943252.

The spelling of 20417913 in words is "twenty million, four hundred seventeen thousand, nine hundred thirteen".