22156002 has 48 divisors (see below), whose sum is σ = 52790400. Its totient is φ = 6660000.

The previous prime is 22155989. The next prime is 22156003. The reversal of 22156002 is 20065122.

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

It is not an unprimeable number, because it can be changed into a prime (22156003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29127 + ... + 29877.

It is an arithmetic number, because the mean of its divisors is an integer number (1099800).

Almost surely, 2^22156002 is an apocalyptic number.

22156002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 22156002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26395200).

22156002 is an abundant number, since it is smaller than the sum of its proper divisors (30634398).

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

22156002 is a wasteful number, since it uses less digits than its factorization.

22156002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 916 counting only the distinct ones).

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

The square root of 22156002 is about 4707.0162523620. The cubic root of 22156002 is about 280.8646824231.

The spelling of 22156002 in words is "twenty-two million, one hundred fifty-six thousand, two".