20551028 has 12 divisors (see below), whose sum is σ = 38079972. Its totient is φ = 9671040.

The previous prime is 20551019. The next prime is 20551043. The reversal of 20551028 is 82015502.

It can be written as a sum of positive squares in 2 ways, for example, as 13853284 + 6697744 = 3722^2 + 2588^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20550994 and 20551012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151043 + ... + 151178.

It is an arithmetic number, because the mean of its divisors is an integer number (3173331).

Almost surely, 2^20551028 is an apocalyptic number.

It is an amenable number.

20551028 is a deficient number, since it is larger than the sum of its proper divisors (17528944).

20551028 is a wasteful number, since it uses less digits than its factorization.

20551028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302242 (or 302240 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20551028 is about 4533.3241666574. The cubic root of 20551028 is about 273.9120786336.

It can be divided in two parts, 2055 and 1028, that multiplied together give a triangular number (2112540 = T₂₀₅₅).

The spelling of 20551028 in words is "twenty million, five hundred fifty-one thousand, twenty-eight".