1020640543 has 16 divisors (see below), whose sum is σ = 1168697376. Its totient is φ = 882984960.

The previous prime is 1020640541. The next prime is 1020640567. The reversal of 1020640543 is 3450460201.

It is not a de Polignac number, because 1020640543 - 2¹ = 1020640541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020640541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43680 + ... + 62842.

It is an arithmetic number, because the mean of its divisors is an integer number (73043586).

Almost surely, 2^1020640543 is an apocalyptic number.

1020640543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1020640543 is a deficient number, since it is larger than the sum of its proper divisors (148056833).

1020640543 is a wasteful number, since it uses less digits than its factorization.

1020640543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19434.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1020640543 is about 31947.4653611206. The cubic root of 1020640543 is about 1006.8333795620.

The spelling of 1020640543 in words is "one billion, twenty million, six hundred forty thousand, five hundred forty-three".