20578668 has 96 divisors (see below), whose sum is σ = 55738368. Its totient is φ = 5851200.

The previous prime is 20578643. The next prime is 20578693. The reversal of 20578668 is 86687502.

It is an interprime number because it is at equal distance from previous prime (20578643) and next prime (20578693).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192271 + ... + 192377.

It is an arithmetic number, because the mean of its divisors is an integer number (580608).

Almost surely, 2^20578668 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 20578668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27869184).

20578668 is an abundant number, since it is smaller than the sum of its proper divisors (35159700).

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

20578668 is a wasteful number, since it uses less digits than its factorization.

20578668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 20578668 is about 4536.3716778941. The cubic root of 20578668 is about 274.0348225052.

The spelling of 20578668 in words is "twenty million, five hundred seventy-eight thousand, six hundred sixty-eight".