201022644 has 24 divisors (see below), whose sum is σ = 472637088. Its totient is φ = 66495520.

The previous prime is 201022639. The next prime is 201022663. The reversal of 201022644 is 446220102.

It is a self number, because there is not a number n which added to its sum of digits gives 201022644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62367 + ... + 65510.

It is an arithmetic number, because the mean of its divisors is an integer number (19693212).

Almost surely, 2^201022644 is an apocalyptic number.

It is an amenable number.

201022644 is an abundant number, since it is smaller than the sum of its proper divisors (271614444).

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

201022644 is a wasteful number, since it uses less digits than its factorization.

201022644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128015 (or 128013 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 201022644 is about 14178.2454485737. The cubic root of 201022644 is about 585.7985966619.

Adding to 201022644 its reverse (446220102), we get a palindrome (647242746).

The spelling of 201022644 in words is "two hundred one million, twenty-two thousand, six hundred forty-four".