1020420635 has 16 divisors (see below), whose sum is σ = 1341053280. Its totient is φ = 740766720.

The previous prime is 1020420617. The next prime is 1020420637. The reversal of 1020420635 is 5360240201.

1020420635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1020420635 - 2²² = 1016226331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020420635.

It is not an unprimeable number, because it can be changed into a prime (1020420637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129206 + ... + 136875.

It is an arithmetic number, because the mean of its divisors is an integer number (83815830).

Almost surely, 2^1020420635 is an apocalyptic number.

1020420635 is a deficient number, since it is larger than the sum of its proper divisors (320632645).

1020420635 is a wasteful number, since it uses less digits than its factorization.

1020420635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266158.

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

The square root of 1020420635 is about 31944.0234629265. The cubic root of 1020420635 is about 1006.7610633354.

Adding to 1020420635 its reverse (5360240201), we get a palindrome (6380660836).

The spelling of 1020420635 in words is "one billion, twenty million, four hundred twenty thousand, six hundred thirty-five".