201420644 has 6 divisors (see below), whose sum is σ = 352486134. Its totient is φ = 100710320.

The previous prime is 201420629. The next prime is 201420647. The reversal of 201420644 is 446024102.

It can be written as a sum of positive squares in only one way, i.e., 199883044 + 1537600 = 14138^2 + 1240^2 .

It is not an unprimeable number, because it can be changed into a prime (201420647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25177577 + ... + 25177584.

It is an arithmetic number, because the mean of its divisors is an integer number (58747689).

Almost surely, 2^201420644 is an apocalyptic number.

It is an amenable number.

201420644 is a deficient number, since it is larger than the sum of its proper divisors (151065490).

201420644 is a wasteful number, since it uses less digits than its factorization.

201420644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50355165 (or 50355163 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 201420644 is about 14192.2740954366. The cubic root of 201420644 is about 586.1849447499.

Adding to 201420644 its reverse (446024102), we get a palindrome (647444746).

The spelling of 201420644 in words is "two hundred one million, four hundred twenty thousand, six hundred forty-four".