1020621 has 24 divisors (see below), whose sum is σ = 1625184. Its totient is φ = 567840.
The previous prime is 1020619. The next prime is 1020631. The reversal of 1020621 is 1260201.
It is not a de Polignac number, because 1020621 - 21 = 1020619 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 1020597 and 1020606.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1020631) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7726 + ... + 7856.
It is an arithmetic number, because the mean of its divisors is an integer number (67716).
21020621 is an apocalyptic number.
It is an amenable number.
1020621 is a deficient number, since it is larger than the sum of its proper divisors (604563).
1020621 is a wasteful number, since it uses less digits than its factorization.
1020621 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 201 (or 194 counting only the distinct ones).
The product of its (nonzero) digits is 24, while the sum is 12.
The square root of 1020621 is about 1010.2578878682. The cubic root of 1020621 is about 100.6826953313.
Adding to 1020621 its reverse (1260201), we get a palindrome (2280822).
The spelling of 1020621 in words is "one million, twenty thousand, six hundred twenty-one".
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