20216610 has 24 divisors (see below), whose sum is σ = 52563420. Its totient is φ = 5391072.

The previous prime is 20216593. The next prime is 20216633. The reversal of 20216610 is 1661202.

It is a happy number.

20216610 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 661 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18896409 + 1320201 = 4347^2 + 1149^2 .

It is a super-2 number, since 2×20216610² = 817422639784200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112225 + ... + 112404.

Almost surely, 2^20216610 is an apocalyptic number.

20216610 is an abundant number, since it is smaller than the sum of its proper divisors (32346810).

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

20216610 is a wasteful number, since it uses less digits than its factorization.

20216610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224642 (or 224639 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20216610 is about 4496.2884693934. The cubic root of 20216610 is about 272.4181950107.

Adding to 20216610 its reverse (1661202), we get a palindrome (21877812).

The spelling of 20216610 in words is "twenty million, two hundred sixteen thousand, six hundred ten".