1020420909 has 24 divisors (see below), whose sum is σ = 1530389952. Its totient is φ = 679453920.

The previous prime is 1020420889. The next prime is 1020420911. The reversal of 1020420909 is 9090240201.

It is not a de Polignac number, because 1020420909 - 2¹⁶ = 1020355373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020420209) 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, 248497 + ... + 252569.

It is an arithmetic number, because the mean of its divisors is an integer number (63766248).

Almost surely, 2^1020420909 is an apocalyptic number.

It is an amenable number.

1020420909 is a deficient number, since it is larger than the sum of its proper divisors (509969043).

1020420909 is an equidigital number, since it uses as much as digits as its factorization.

1020420909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5119 (or 5107 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1020420909 is about 31944.0277516784. The cubic root of 1020420909 is about 1006.7611534461.

It can be divided in two parts, 10204 and 20909, that added together give a palindrome (31113).

The spelling of 1020420909 in words is "one billion, twenty million, four hundred twenty thousand, nine hundred nine".