22261554 has 80 divisors (see below), whose sum is σ = 58056768. Its totient is φ = 6244128.

The previous prime is 22261549. The next prime is 22261571. The reversal of 22261554 is 45516222.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 75832 + ... + 76124.

Almost surely, 2^22261554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22261554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29028384).

22261554 is an abundant number, since it is smaller than the sum of its proper divisors (35795214).

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

22261554 is a wasteful number, since it uses less digits than its factorization.

22261554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 372 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 22261554 is about 4718.2151286265. The cubic root of 22261554 is about 281.3099925356.

Adding to 22261554 its reverse (45516222), we get a palindrome (67777776).

It can be divided in two parts, 222 and 61554, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 22261554 in words is "twenty-two million, two hundred sixty-one thousand, five hundred fifty-four".