20320217401 has 9 divisors (see below), whose sum is σ = 22337169253. Its totient is φ = 18471499420.

The previous prime is 20320217387. The next prime is 20320217431. The reversal of 20320217401 is 10471202302.

The square root of 20320217401 is 142549.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20320217401 - 2¹¹ = 20320215353 is a prime.

It is a super-2 number, since 2×20320217401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320217431) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1561560 + ... + 1574518.

Almost surely, 2^20320217401 is an apocalyptic number.

20320217401 is the 142549-th square number.

20320217401 is the 71275-th centered octagonal number.

It is an amenable number.

20320217401 is a deficient number, since it is larger than the sum of its proper divisors (2016951852).

20320217401 is an frugal number, since it uses more digits than its factorization.

20320217401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25940 (or 12970 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 20320217401 its reverse (10471202302), we get a palindrome (30791419703).

The spelling of 20320217401 in words is "twenty billion, three hundred twenty million, two hundred seventeen thousand, four hundred one".