620432221 has 16 divisors (see below), whose sum is σ = 669078144. Its totient is φ = 573228544.

The previous prime is 620432209. The next prime is 620432227. The reversal of 620432221 is 122234026.

It is not a de Polignac number, because 620432221 - 2¹⁵ = 620399453 is a prime.

It is a super-2 number, since 2×620432221² = 769872281709985682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 620432192 and 620432201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620432227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234321 + ... + 236953.

It is an arithmetic number, because the mean of its divisors is an integer number (41817384).

Almost surely, 2^620432221 is an apocalyptic number.

It is an amenable number.

620432221 is a deficient number, since it is larger than the sum of its proper divisors (48645923).

620432221 is a wasteful number, since it uses less digits than its factorization.

620432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 620432221 is about 24908.4768904082. The cubic root of 620432221 is about 852.9000005091.

Adding to 620432221 its reverse (122234026), we get a palindrome (742666247).

The spelling of 620432221 in words is "six hundred twenty million, four hundred thirty-two thousand, two hundred twenty-one".