20404451443252 has 12 divisors (see below), whose sum is σ = 35707916506276. Its totient is φ = 10202189584320.

The previous prime is 20404451443249. The next prime is 20404451443279. The reversal of 20404451443252 is 25234415440402.

It can be written as a sum of positive squares in 2 ways, for example, as 2542704511396 + 17861746931856 = 1594586^2 + 4226316^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7743399 + ... + 10038382.

Almost surely, 2^{20404451443252} is an apocalyptic number.

It is an amenable number.

20404451443252 is a deficient number, since it is larger than the sum of its proper divisors (15303465063024).

20404451443252 is a wasteful number, since it uses less digits than its factorization.

20404451443252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18068658 (or 18068656 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 20404451443252 its reverse (25234415440402), we get a palindrome (45638866883654).

The spelling of 20404451443252 in words is "twenty trillion, four hundred four billion, four hundred fifty-one million, four hundred forty-three thousand, two hundred fifty-two".