20284621 has 24 divisors (see below), whose sum is σ = 25385216. Its totient is φ = 15863040.

The previous prime is 20284603. The next prime is 20284639. The reversal of 20284621 is 12648202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20284603) and next prime (20284639).

It is not a de Polignac number, because 20284621 - 2⁹ = 20284109 is a prime.

It is a super-2 number, since 2×20284621² = 822931698227282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74716 + ... + 74986.

Almost surely, 2^20284621 is an apocalyptic number.

It is an amenable number.

20284621 is a deficient number, since it is larger than the sum of its proper divisors (5100595).

20284621 is a wasteful number, since it uses less digits than its factorization.

20284621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20284621 is about 4503.8451349930. The cubic root of 20284621 is about 272.7233351317.

The spelling of 20284621 in words is "twenty million, two hundred eighty-four thousand, six hundred twenty-one".