1020355423 has 4 divisors (see below), whose sum is σ = 1074058360. Its totient is φ = 966652488.

The previous prime is 1020355409. The next prime is 1020355439. The reversal of 1020355423 is 3245530201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020355423 is a prime.

It is a super-2 number, since 2×1020355423² = 2082250378491017858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020355123) 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, 26851440 + ... + 26851477.

It is an arithmetic number, because the mean of its divisors is an integer number (268514590).

Almost surely, 2^1020355423 is an apocalyptic number.

1020355423 is a deficient number, since it is larger than the sum of its proper divisors (53702937).

1020355423 is an equidigital number, since it uses as much as digits as its factorization.

1020355423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53702936.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 1020355423 is about 31943.0027236013. The cubic root of 1020355423 is about 1006.7396165258.

Adding to 1020355423 its reverse (3245530201), we get a palindrome (4265885624).

The spelling of 1020355423 in words is "one billion, twenty million, three hundred fifty-five thousand, four hundred twenty-three".