20297146538 has 4 divisors (see below), whose sum is σ = 30445719810. Its totient is φ = 10148573268.

The previous prime is 20297146531. The next prime is 20297146577. The reversal of 20297146538 is 83564179202.

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

It can be written as a sum of positive squares in only one way, i.e., 11061359929 + 9235786609 = 105173^2 + 96103^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20297146492 and 20297146501.

It is not an unprimeable number, because it can be changed into a prime (20297146531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5074286633 + ... + 5074286636.

It is a 1-persistent number, because it is pandigital, but 2⋅20297146538 = 40594293076 is not.

Almost surely, 2^20297146538 is an apocalyptic number.

20297146538 is a deficient number, since it is larger than the sum of its proper divisors (10148573272).

20297146538 is a wasteful number, since it uses less digits than its factorization.

20297146538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10148573271.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20297146538 in words is "twenty billion, two hundred ninety-seven million, one hundred forty-six thousand, five hundred thirty-eight".