20438947983498 has 128 divisors (see below), whose sum is σ = 47848906082304. Its totient is φ = 5757181689600.

The previous prime is 20438947983497. The next prime is 20438947983511. The reversal of 20438947983498 is 89438974983402.

It is not an unprimeable number, because it can be changed into a prime (20438947983491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45890665 + ... + 46333907.

It is an arithmetic number, because the mean of its divisors is an integer number (373819578768).

Almost surely, 2^{20438947983498} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20438947983498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23924453041152).

20438947983498 is an abundant number, since it is smaller than the sum of its proper divisors (27409958098806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20438947983498 is a wasteful number, since it uses less digits than its factorization.

20438947983498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444140.

The product of its (nonzero) digits is 3009871872, while the sum is 78.

The spelling of 20438947983498 in words is "twenty trillion, four hundred thirty-eight billion, nine hundred forty-seven million, nine hundred eighty-three thousand, four hundred ninety-eight".