20915496 has 192 divisors, whose sum is σ = 70761600. Its totient is φ = 5660928.

The previous prime is 20915473. The next prime is 20915507. The reversal of 20915496 is 69451902.

20915496 is a `hidden beast` number, since 20 + 91 + 549 + 6 = 666.

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 20915496.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 394606 + ... + 394658.

It is an arithmetic number, because the mean of its divisors is an integer number (368550).

Almost surely, 2^20915496 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 20915496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35380800).

20915496 is an abundant number, since it is smaller than the sum of its proper divisors (49846104).

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

20915496 is a wasteful number, since it uses less digits than its factorization.

20915496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20915496 is about 4573.3462584851. The cubic root of 20915496 is about 275.5218564505.

The spelling of 20915496 in words is "twenty million, nine hundred fifteen thousand, four hundred ninety-six".