20401717 has 16 divisors (see below), whose sum is σ = 24855552. Its totient is φ = 16346880.

The previous prime is 20401709. The next prime is 20401721. The reversal of 20401717 is 71710402.

It is a cyclic number.

It is not a de Polignac number, because 20401717 - 2³ = 20401709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20092 + ... + 21082.

It is an arithmetic number, because the mean of its divisors is an integer number (1553472).

Almost surely, 2^20401717 is an apocalyptic number.

It is an amenable number.

20401717 is a deficient number, since it is larger than the sum of its proper divisors (4453835).

20401717 is a wasteful number, since it uses less digits than its factorization.

20401717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 20401717 is about 4516.8259873500. The cubic root of 20401717 is about 273.2471072787.

The spelling of 20401717 in words is "twenty million, four hundred one thousand, seven hundred seventeen".