1020720515641 has 16 divisors (see below), whose sum is σ = 1096081956864. Its totient is φ = 947073544704.

The previous prime is 1020720515629. The next prime is 1020720515651. The reversal of 1020720515641 is 1465150270201.

It is not a de Polignac number, because 1020720515641 - 2⁷ = 1020720515513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020720515597 and 1020720515606.

It is not an unprimeable number, because it can be changed into a prime (1020720515651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2467560 + ... + 2851366.

It is an arithmetic number, because the mean of its divisors is an integer number (68505122304).

Almost surely, 2^{1020720515641} is an apocalyptic number.

It is an amenable number.

1020720515641 is a deficient number, since it is larger than the sum of its proper divisors (75361441223).

1020720515641 is a wasteful number, since it uses less digits than its factorization.

1020720515641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386040.

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 1020720515641 its reverse (1465150270201), we get a palindrome (2485870785842).

The spelling of 1020720515641 in words is "one trillion, twenty billion, seven hundred twenty million, five hundred fifteen thousand, six hundred forty-one".