1020340404 has 18 divisors (see below), whose sum is σ = 2579193890. Its totient is φ = 340113456.

The previous prime is 1020340397. The next prime is 1020340469. The reversal of 1020340404 is 4040430201.

It can be written as a sum of positive squares in only one way, i.e., 1015059600 + 5280804 = 31860^2 + 2298^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14171359 + ... + 14171430.

Almost surely, 2^1020340404 is an apocalyptic number.

It is an amenable number.

1020340404 is an abundant number, since it is smaller than the sum of its proper divisors (1558853486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020340404 is a wasteful number, since it uses less digits than its factorization.

1020340404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28342799 (or 28342794 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1020340404 is about 31942.7676321261. The cubic root of 1020340404 is about 1006.7346769737.

Adding to 1020340404 its reverse (4040430201), we get a palindrome (5060770605).

The spelling of 1020340404 in words is "one billion, twenty million, three hundred forty thousand, four hundred four".