20551026 has 16 divisors (see below), whose sum is σ = 41317344. Its totient is φ = 6814464.

The previous prime is 20551019. The next prime is 20551043. The reversal of 20551026 is 62015502.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20550993 and 20551011.

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 7 ways as a sum of consecutive naturals, for example, 7716 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (2582334).

Almost surely, 2^20551026 is an apocalyptic number.

20551026 is an abundant number, since it is smaller than the sum of its proper divisors (20766318).

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

20551026 is a wasteful number, since it uses less digits than its factorization.

20551026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17945.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20551026 is about 4533.3239460687. The cubic root of 20551026 is about 273.9120697480.

Adding to 20551026 its reverse (62015502), we get a palindrome (82566528).

It can be divided in two parts, 2055 and 1026, that added together give a triangular number (3081 = T₇₈).

The spelling of 20551026 in words is "twenty million, five hundred fifty-one thousand, twenty-six".