20403378489 has 16 divisors (see below), whose sum is σ = 29303829632. Its totient is φ = 12553066368.

The previous prime is 20403378433. The next prime is 20403378493. The reversal of 20403378489 is 98487330402.

It is not a de Polignac number, because 20403378489 - 2¹² = 20403374393 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20403378409) 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, 120837 + ... + 235389.

It is an arithmetic number, because the mean of its divisors is an integer number (1831489352).

Almost surely, 2^20403378489 is an apocalyptic number.

It is an amenable number.

20403378489 is a deficient number, since it is larger than the sum of its proper divisors (8900451143).

20403378489 is a wasteful number, since it uses less digits than its factorization.

20403378489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119136.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 20403378489 in words is "twenty billion, four hundred three million, three hundred seventy-eight thousand, four hundred eighty-nine".