1020320240531 has 4 divisors (see below), whose sum is σ = 1020327310464. Its totient is φ = 1020313170600.

The previous prime is 1020320240507. The next prime is 1020320240539. The reversal of 1020320240531 is 1350420230201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020320240531 - 2¹⁸ = 1020319978387 is a prime.

It is a super-2 number, since 2×1020320240531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020320240497 and 1020320240506.

It is not an unprimeable number, because it can be changed into a prime (1020320240539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3313880 + ... + 3608661.

It is an arithmetic number, because the mean of its divisors is an integer number (255081827616).

Almost surely, 2^{1020320240531} is an apocalyptic number.

1020320240531 is a deficient number, since it is larger than the sum of its proper divisors (7069933).

1020320240531 is an equidigital number, since it uses as much as digits as its factorization.

1020320240531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7069932.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 1020320240531 its reverse (1350420230201), we get a palindrome (2370740470732).

The spelling of 1020320240531 in words is "one trillion, twenty billion, three hundred twenty million, two hundred forty thousand, five hundred thirty-one".