20011216 has 10 divisors (see below), whose sum is σ = 38771762. Its totient is φ = 10005600.

The previous prime is 20011177. The next prime is 20011249. The reversal of 20011216 is 61211002.

It can be written as a sum of positive squares in only one way, i.e., 16842816 + 3168400 = 4104^2 + 1780^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20011196 and 20011205.

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, 625335 + ... + 625366.

Almost surely, 2^20011216 is an apocalyptic number.

It is an amenable number.

20011216 is a deficient number, since it is larger than the sum of its proper divisors (18760546).

20011216 is a wasteful number, since it uses less digits than its factorization.

20011216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250709 (or 1250703 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20011216 is about 4473.3897661617. The cubic root of 20011216 is about 271.4924936905.

Adding to 20011216 its reverse (61211002), we get a palindrome (81222218).

The spelling of 20011216 in words is "twenty million, eleven thousand, two hundred sixteen".