20685349546 has 4 divisors (see below), whose sum is σ = 31028024322. Its totient is φ = 10342674772.

The previous prime is 20685349543. The next prime is 20685349547. The reversal of 20685349546 is 64594358602.

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., 20682754225 + 2595321 = 143815^2 + 1611^2 .

It is a super-2 number, since 2×20685349546² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20685349493 and 20685349502.

It is not an unprimeable number, because it can be changed into a prime (20685349543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5171337385 + ... + 5171337388.

Almost surely, 2^20685349546 is an apocalyptic number.

20685349546 is a deficient number, since it is larger than the sum of its proper divisors (10342674776).

20685349546 is a wasteful number, since it uses less digits than its factorization.

20685349546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10342674775.

The product of its (nonzero) digits is 6220800, while the sum is 52.

The spelling of 20685349546 in words is "twenty billion, six hundred eighty-five million, three hundred forty-nine thousand, five hundred forty-six".