1020635431 has 4 divisors (see below), whose sum is σ = 1025979264. Its totient is φ = 1015291600.

The previous prime is 1020635423. The next prime is 1020635449. The reversal of 1020635431 is 1345360201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1345360201 = 67 ⋅20080003.

It is a cyclic number.

It is not a de Polignac number, because 1020635431 - 2³ = 1020635423 is a prime.

It is a super-2 number, since 2×1020635431² = 2083393366025111522, 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 = 1020635396 and 1020635405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020605431) 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 3 ways as a sum of consecutive naturals, for example, 2671630 + ... + 2672011.

It is an arithmetic number, because the mean of its divisors is an integer number (256494816).

Almost surely, 2^1020635431 is an apocalyptic number.

1020635431 is a deficient number, since it is larger than the sum of its proper divisors (5343833).

1020635431 is an equidigital number, since it uses as much as digits as its factorization.

1020635431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5343832.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1020635431 is about 31947.3853546734. The cubic root of 1020635431 is about 1006.8316986108.

Adding to 1020635431 its reverse (1345360201), we get a palindrome (2365995632).

The spelling of 1020635431 in words is "one billion, twenty million, six hundred thirty-five thousand, four hundred thirty-one".