1920680993 has 16 divisors (see below), whose sum is σ = 2402295936. Its totient is φ = 1491834240.

The previous prime is 1920680969. The next prime is 1920681013. The reversal of 1920680993 is 3990860291.

It is a cyclic number.

It is not a de Polignac number, because 1920680993 - 2⁸ = 1920680737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1920680903) 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, 15746 + ... + 63947.

It is an arithmetic number, because the mean of its divisors is an integer number (150143496).

Almost surely, 2^1920680993 is an apocalyptic number.

It is an amenable number.

1920680993 is a deficient number, since it is larger than the sum of its proper divisors (481614943).

1920680993 is a wasteful number, since it uses less digits than its factorization.

1920680993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80024.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1920680993 is about 43825.5746454054. The cubic root of 1920680993 is about 1243.0399297055.

The spelling of 1920680993 in words is "one billion, nine hundred twenty million, six hundred eighty thousand, nine hundred ninety-three".