20484387 has 64 divisors (see below), whose sum is σ = 38707200. Its totient is φ = 10398240.

The previous prime is 20484319. The next prime is 20484391. The reversal of 20484387 is 78348402.

It is not a de Polignac number, because 20484387 - 2⁷ = 20484259 is a prime.

It is a super-2 number, since 2×20484387² = 839220221531538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20484307) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 122578 + ... + 122744.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^20484387 is an apocalyptic number.

20484387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20484387 is a deficient number, since it is larger than the sum of its proper divisors (18222813).

20484387 is a wasteful number, since it uses less digits than its factorization.

20484387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 247 counting only the distinct ones).

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

The square root of 20484387 is about 4525.9680732413. The cubic root of 20484387 is about 273.6156856581.

The spelling of 20484387 in words is "twenty million, four hundred eighty-four thousand, three hundred eighty-seven".