20447201869 has 4 divisors (see below), whose sum is σ = 20645718496. Its totient is φ = 20248685244.

The previous prime is 20447201821. The next prime is 20447201893. The reversal of 20447201869 is 96810274402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20447201869 - 2¹³ = 20447193677 is a prime.

It is a super-2 number, since 2×20447201869² (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 (20447201069) 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, 99258159 + ... + 99258364.

It is an arithmetic number, because the mean of its divisors is an integer number (5161429624).

Almost surely, 2^20447201869 is an apocalyptic number.

It is an amenable number.

20447201869 is a deficient number, since it is larger than the sum of its proper divisors (198516627).

20447201869 is a wasteful number, since it uses less digits than its factorization.

20447201869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198516626.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 20447201869 in words is "twenty billion, four hundred forty-seven million, two hundred one thousand, eight hundred sixty-nine".