20459628 has 144 divisors (see below), whose sum is σ = 63924224. Its totient is φ = 5598720.

The previous prime is 20459623. The next prime is 20459629. The reversal of 20459628 is 82695402.

It is a happy number.

20459628 is a `hidden beast` number, since 20 + 4 + 5 + 9 + 628 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20459592 and 20459601.

It is not an unprimeable number, because it can be changed into a prime (20459623) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210876 + ... + 210972.

Almost surely, 2^20459628 is an apocalyptic number.

20459628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20459628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31962112).

20459628 is an abundant number, since it is smaller than the sum of its proper divisors (43464596).

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

20459628 is a wasteful number, since it uses less digits than its factorization.

20459628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20459628 is about 4523.2320303075. The cubic root of 20459628 is about 273.5054035854.

The spelling of 20459628 in words is "twenty million, four hundred fifty-nine thousand, six hundred twenty-eight".