20225511 has 8 divisors (see below), whose sum is σ = 29963760. Its totient is φ = 13483656.

The previous prime is 20225507. The next prime is 20225521. The reversal of 20225511 is 11552202.

It is not a de Polignac number, because 20225511 - 2² = 20225507 is a prime.

It is a super-2 number, since 2×20225511² = 818142590422242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20225521) 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, 374520 + ... + 374573.

It is an arithmetic number, because the mean of its divisors is an integer number (3745470).

Almost surely, 2^20225511 is an apocalyptic number.

20225511 is a deficient number, since it is larger than the sum of its proper divisors (9738249).

20225511 is an equidigital number, since it uses as much as digits as its factorization.

20225511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749102 (or 749096 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 20225511 is about 4497.2781768532. The cubic root of 20225511 is about 272.4581693779.

Adding to 20225511 its reverse (11552202), we get a palindrome (31777713).

It can be divided in two parts, 20225 and 511, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20225511 in words is "twenty million, two hundred twenty-five thousand, five hundred eleven".