20467656 has 96 divisors (see below), whose sum is σ = 61981920. Its totient is φ = 6048000.

The previous prime is 20467639. The next prime is 20467669. The reversal of 20467656 is 65676402.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20467656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33756 + ... + 34356.

It is an arithmetic number, because the mean of its divisors is an integer number (645645).

Almost surely, 2^20467656 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 20467656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30990960).

20467656 is an abundant number, since it is smaller than the sum of its proper divisors (41514264).

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

20467656 is a wasteful number, since it uses less digits than its factorization.

20467656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 20467656 is about 4524.1193618206. The cubic root of 20467656 is about 273.5411718190.

The spelling of 20467656 in words is "twenty million, four hundred sixty-seven thousand, six hundred fifty-six".