20387268 has 72 divisors (see below), whose sum is σ = 58104480. Its totient is φ = 6130800.

The previous prime is 20387249. The next prime is 20387287. The reversal of 20387268 is 86278302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20387249) and next prime (20387287).

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

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, 155563 + ... + 155693.

Almost surely, 2^20387268 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 20387268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29052240).

20387268 is an abundant number, since it is smaller than the sum of its proper divisors (37717212).

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

20387268 is a wasteful number, since it uses less digits than its factorization.

20387268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20387268 is about 4515.2262401789. The cubic root of 20387268 is about 273.1825852603.

The spelling of 20387268 in words is "twenty million, three hundred eighty-seven thousand, two hundred sixty-eight".