20340516 has 48 divisors (see below), whose sum is σ = 54462464. Its totient is φ = 5787936.

The previous prime is 20340497. The next prime is 20340521. The reversal of 20340516 is 61504302.

It is a happy number.

It is a super-2 number, since 2×20340516² = 827473182292512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20340492 and 20340501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38631 + ... + 39153.

Almost surely, 2^20340516 is an apocalyptic number.

It is an amenable number.

20340516 is an abundant number, since it is smaller than the sum of its proper divisors (34121948).

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

20340516 is a wasteful number, since it uses less digits than its factorization.

20340516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 998 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20340516 is about 4510.0461194981. The cubic root of 20340516 is about 272.9736050371.

Adding to 20340516 its reverse (61504302), we get a palindrome (81844818).

The spelling of 20340516 in words is "twenty million, three hundred forty thousand, five hundred sixteen".