20889273890 has 16 divisors (see below), whose sum is σ = 38616928632. Its totient is φ = 8129879424.

The previous prime is 20889273859. The next prime is 20889273907. The reversal of 20889273890 is 9837298802.

It can be written as a sum of positive squares in 4 ways, for example, as 15141056401 + 5748217489 = 123049^2 + 75817^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28228379 + ... + 28229118.

Almost surely, 2^20889273890 is an apocalyptic number.

20889273890 is a deficient number, since it is larger than the sum of its proper divisors (17727654742).

20889273890 is a wasteful number, since it uses less digits than its factorization.

20889273890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56457541.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 20889273890 in words is "twenty billion, eight hundred eighty-nine million, two hundred seventy-three thousand, eight hundred ninety".