20021516 has 24 divisors (see below), whose sum is σ = 37181760. Its totient is φ = 9406800.

The previous prime is 20021501. The next prime is 20021527. The reversal of 20021516 is 61512002.

It is a super-2 number, since 2×20021516² = 801722205876512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20021494 and 20021503.

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, 8951 + ... + 10961.

It is an arithmetic number, because the mean of its divisors is an integer number (1549240).

Almost surely, 2^20021516 is an apocalyptic number.

It is an amenable number.

20021516 is a deficient number, since it is larger than the sum of its proper divisors (17160244).

20021516 is a wasteful number, since it uses less digits than its factorization.

20021516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165 (or 2163 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20021516 is about 4474.5408703017. The cubic root of 20021516 is about 271.5390657903.

Adding to 20021516 its reverse (61512002), we get a palindrome (81533518).

The spelling of 20021516 in words is "twenty million, twenty-one thousand, five hundred sixteen".