20226987 has 24 divisors (see below), whose sum is σ = 32084208. Its totient is φ = 12177600.

The previous prime is 20226971. The next prime is 20226989. The reversal of 20226987 is 78962202.

It is not a de Polignac number, because 20226987 - 2⁴ = 20226971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20226989) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 16537 + ... + 17717.

It is an arithmetic number, because the mean of its divisors is an integer number (1336842).

Almost surely, 2^20226987 is an apocalyptic number.

20226987 is a deficient number, since it is larger than the sum of its proper divisors (11857221).

20226987 is a wasteful number, since it uses less digits than its factorization.

20226987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20226987 is about 4497.4422731148. The cubic root of 20226987 is about 272.4647969563.

It can be divided in two parts, 2022 and 6987, that added together give a palindrome (9009).

The spelling of 20226987 in words is "twenty million, two hundred twenty-six thousand, nine hundred eighty-seven".