20618472 has 128 divisors (see below), whose sum is σ = 63037440. Its totient is φ = 5495040.

The previous prime is 20618459. The next prime is 20618489. The reversal of 20618472 is 27481602.

It is a super-2 number, since 2×20618472² = 850242775229568, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 192643 + ... + 192749.

It is an arithmetic number, because the mean of its divisors is an integer number (492480).

Almost surely, 2^20618472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20618472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31518720).

20618472 is an abundant number, since it is smaller than the sum of its proper divisors (42418968).

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

20618472 is a wasteful number, since it uses less digits than its factorization.

20618472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20618472 is about 4540.7567651219. The cubic root of 20618472 is about 274.2113913830.

The spelling of 20618472 in words is "twenty million, six hundred eighteen thousand, four hundred seventy-two".