20487384 has 32 divisors (see below), whose sum is σ = 56910000. Its totient is φ = 6829056.

The previous prime is 20487371. The next prime is 20487403. The reversal of 20487384 is 48378402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47209 + ... + 47640.

Almost surely, 2^20487384 is an apocalyptic number.

20487384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20487384 is an abundant number, since it is smaller than the sum of its proper divisors (36422616).

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

20487384 is a wasteful number, since it uses less digits than its factorization.

20487384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94864 (or 94854 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 20487384 is about 4526.2991505202. The cubic root of 20487384 is about 273.6290289298.

The spelling of 20487384 in words is "twenty million, four hundred eighty-seven thousand, three hundred eighty-four".