20498517437 has 4 divisors (see below), whose sum is σ = 20686577340. Its totient is φ = 20310457536.

The previous prime is 20498517433. The next prime is 20498517439. The reversal of 20498517437 is 73471589402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9164998756 + 11333518681 = 95734^2 + 106459^2 .

It is a cyclic number.

It is not a de Polignac number, because 20498517437 - 2² = 20498517433 is a prime.

It is a super-2 number, since 2×20498517437² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 94029788 + ... + 94030005.

It is an arithmetic number, because the mean of its divisors is an integer number (5171644335).

Almost surely, 2^20498517437 is an apocalyptic number.

It is an amenable number.

20498517437 is a deficient number, since it is larger than the sum of its proper divisors (188059903).

20498517437 is a wasteful number, since it uses less digits than its factorization.

20498517437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188059902.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 20498517437 in words is "twenty billion, four hundred ninety-eight million, five hundred seventeen thousand, four hundred thirty-seven".