20498517438 has 64 divisors (see below), whose sum is σ = 48459251712. Its totient is φ = 5656767840.

The previous prime is 20498517433. The next prime is 20498517439. The reversal of 20498517438 is 83471589402.

It is a happy number.

20498517438 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20498517433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 665895 + ... + 695997.

It is an arithmetic number, because the mean of its divisors is an integer number (757175808).

Almost surely, 2^20498517438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20498517438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24229625856).

20498517438 is an abundant number, since it is smaller than the sum of its proper divisors (27960734274).

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

20498517438 is a wasteful number, since it uses less digits than its factorization.

20498517438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30669.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 20498517438 in words is "twenty billion, four hundred ninety-eight million, five hundred seventeen thousand, four hundred thirty-eight".