201722420 has 24 divisors (see below), whose sum is σ = 442036224. Its totient is φ = 77180576.

The previous prime is 201722407. The next prime is 201722429. The reversal of 201722420 is 24227102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 201722392 and 201722401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201722429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218804 + ... + 219723.

It is an arithmetic number, because the mean of its divisors is an integer number (18418176).

Almost surely, 2^201722420 is an apocalyptic number.

201722420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201722420 is an abundant number, since it is smaller than the sum of its proper divisors (240313804).

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

201722420 is a wasteful number, since it uses less digits than its factorization.

201722420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438559 (or 438557 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 201722420 is about 14202.9018161783. The cubic root of 201722420 is about 586.4775467949.

Adding to 201722420 its reverse (24227102), we get a palindrome (225949522).

The spelling of 201722420 in words is "two hundred one million, seven hundred twenty-two thousand, four hundred twenty".