20587028 has 24 divisors (see below), whose sum is σ = 44917824. Its totient is φ = 8020800.

The previous prime is 20587027. The next prime is 20587033. The reversal of 20587028 is 82078502.

It is a junction number, because it is equal to n+sod(n) for n = 20586985 and 20587003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20587027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33113 + ... + 33728.

It is an arithmetic number, because the mean of its divisors is an integer number (1871576).

Almost surely, 2^20587028 is an apocalyptic number.

20587028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20587028 is an abundant number, since it is smaller than the sum of its proper divisors (24330796).

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

20587028 is a wasteful number, since it uses less digits than its factorization.

20587028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66863 (or 66861 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 20587028 is about 4537.2930255825. The cubic root of 20587028 is about 274.0719259912.

The spelling of 20587028 in words is "twenty million, five hundred eighty-seven thousand, twenty-eight".