20423316 has 24 divisors (see below), whose sum is σ = 47922784. Its totient is φ = 6769440.

The previous prime is 20423257. The next prime is 20423329. The reversal of 20423316 is 61332402.

It is a happy number.

It is a super-2 number, since 2×20423316² = 834223672871712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20423292 and 20423301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2530 + ... + 6873.

Almost surely, 2^20423316 is an apocalyptic number.

It is an amenable number.

20423316 is an abundant number, since it is smaller than the sum of its proper divisors (27499468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423316 is a wasteful number, since it uses less digits than its factorization.

20423316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9591 (or 9589 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20423316 is about 4519.2163037412. The cubic root of 20423316 is about 273.3435008446.

Adding to 20423316 its reverse (61332402), we get a palindrome (81755718).

The spelling of 20423316 in words is "twenty million, four hundred twenty-three thousand, three hundred sixteen".