1020649720 has 32 divisors (see below), whose sum is σ = 2349871920. Its totient is φ = 398764800.

The previous prime is 1020649717. The next prime is 1020649741. The reversal of 1020649720 is 279460201.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 294981 + ... + 298420.

Almost surely, 2^1020649720 is an apocalyptic number.

1020649720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020649720 is an abundant number, since it is smaller than the sum of its proper divisors (1329222200).

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

1020649720 is a wasteful number, since it uses less digits than its factorization.

1020649720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593455 (or 593451 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1020649720 is about 31947.6089872153. The cubic root of 1020649720 is about 1006.8363971710.

The spelling of 1020649720 in words is "one billion, twenty million, six hundred forty-nine thousand, seven hundred twenty".