22002156 has 54 divisors (see below), whose sum is σ = 61144356. Its totient is φ = 6666000.

The previous prime is 22002121. The next prime is 22002163. The reversal of 22002156 is 65120022.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1831 + ... + 6881.

Almost surely, 2^22002156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22002156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30572178).

22002156 is an abundant number, since it is smaller than the sum of its proper divisors (39142200).

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

22002156 is a wasteful number, since it uses less digits than its factorization.

22002156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083 (or 5067 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 22002156 is about 4690.6455845651. The cubic root of 22002156 is about 280.2130860950.

Adding to 22002156 its reverse (65120022), we get a palindrome (87122178).

It can be divided in two parts, 2200 and 2156, that added together give a square (4356 = 66²).

The spelling of 22002156 in words is "twenty-two million, two thousand, one hundred fifty-six".