1019204820 has 36 divisors (see below), whose sum is σ = 3091588500. Its totient is φ = 271787904.

The previous prime is 1019204807. The next prime is 1019204831. The reversal of 1019204820 is 284029101.

It can be written as a sum of positive squares in 2 ways, for example, as 295702416 + 723502404 = 17196^2 + 26898^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1019204820² = 2077556930222464800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2830945 + ... + 2831304.

Almost surely, 2^1019204820 is an apocalyptic number.

1019204820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1019204820 is an abundant number, since it is smaller than the sum of its proper divisors (2072383680).

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

1019204820 is a wasteful number, since it uses less digits than its factorization.

1019204820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5662264 (or 5662259 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1019204820 is about 31924.9873923233. The cubic root of 1019204820 is about 1006.3610578142.

The spelling of 1019204820 in words is "one billion, nineteen million, two hundred four thousand, eight hundred twenty".