20320217402 has 32 divisors (see below), whose sum is σ = 32538186000. Its totient is φ = 9484162048.

The previous prime is 20320217387. The next prime is 20320217431. The reversal of 20320217402 is 20471202302.

It is a happy number.

It is a Cunningham number, because it is equal to 142549²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 6561162001 + 13759055401 = 81001^2 + 117299^2 .

It is a super-2 number, since 2×20320217402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3913424 + ... + 3918612.

Almost surely, 2^20320217402 is an apocalyptic number.

20320217402 is a deficient number, since it is larger than the sum of its proper divisors (12217968598).

20320217402 is a wasteful number, since it uses less digits than its factorization.

20320217402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6130.

The product of its (nonzero) digits is 1344, while the sum is 23.

Adding to 20320217402 its reverse (20471202302), we get a palindrome (40791419704).

The spelling of 20320217402 in words is "twenty billion, three hundred twenty million, two hundred seventeen thousand, four hundred two".