22051920 has 80 divisors (see below), whose sum is σ = 74584512. Its totient is φ = 5345280.

The previous prime is 22051903. The next prime is 22051937. The reversal of 22051920 is 2915022.

It is an interprime number because it is at equal distance from previous prime (22051903) and next prime (22051937).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1537 + ... + 6816.

Almost surely, 2^22051920 is an apocalyptic number.

22051920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22051920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37292256).

22051920 is an abundant number, since it is smaller than the sum of its proper divisors (52532592).

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

22051920 is a wasteful number, since it uses less digits than its factorization.

22051920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8380 (or 8374 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 22051920 is about 4695.9471888001. The cubic root of 22051920 is about 280.4241869839.

Adding to 22051920 its reverse (2915022), we get a palindrome (24966942).

The spelling of 22051920 in words is "twenty-two million, fifty-one thousand, nine hundred twenty".