20450516 has 6 divisors (see below), whose sum is σ = 35788410. Its totient is φ = 10225256.

The previous prime is 20450491. The next prime is 20450531. The reversal of 20450516 is 61505402.

It can be written as a sum of positive squares in only one way, i.e., 16370116 + 4080400 = 4046^2 + 2020^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20450491 and 20450500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2556311 + ... + 2556318.

It is an arithmetic number, because the mean of its divisors is an integer number (5964735).

Almost surely, 2^20450516 is an apocalyptic number.

It is an amenable number.

20450516 is a deficient number, since it is larger than the sum of its proper divisors (15337894).

20450516 is a wasteful number, since it uses less digits than its factorization.

20450516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5112633 (or 5112631 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20450516 is about 4522.2246737640. The cubic root of 20450516 is about 273.4647943214.

Adding to 20450516 its reverse (61505402), we get a palindrome (81955918).

The spelling of 20450516 in words is "twenty million, four hundred fifty thousand, five hundred sixteen".