20421526 has 16 divisors (see below), whose sum is σ = 31515120. Its totient is φ = 9918720.

The previous prime is 20421503. The next prime is 20421553. The reversal of 20421526 is 62512402.

It is a junction number, because it is equal to n+sod(n) for n = 20421497 and 20421506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27265 + ... + 28003.

It is an arithmetic number, because the mean of its divisors is an integer number (1969695).

Almost surely, 2^20421526 is an apocalyptic number.

20421526 is a deficient number, since it is larger than the sum of its proper divisors (11093594).

20421526 is a wasteful number, since it uses less digits than its factorization.

20421526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20421526 is about 4519.0182562145. The cubic root of 20421526 is about 273.3355148877.

Adding to 20421526 its reverse (62512402), we get a palindrome (82933928).

The spelling of 20421526 in words is "twenty million, four hundred twenty-one thousand, five hundred twenty-six".