20143786394 has 4 divisors (see below), whose sum is σ = 30215679594. Its totient is φ = 10071893196.

The previous prime is 20143786393. The next prime is 20143786417. The reversal of 20143786394 is 49368734102.

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., 17828925625 + 2314860769 = 133525^2 + 48113^2 .

It is not an unprimeable number, because it can be changed into a prime (20143786393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5035946597 + ... + 5035946600.

Almost surely, 2^20143786394 is an apocalyptic number.

20143786394 is a deficient number, since it is larger than the sum of its proper divisors (10071893200).

20143786394 is a wasteful number, since it uses less digits than its factorization.

20143786394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10071893199.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 20143786394 in words is "twenty billion, one hundred forty-three million, seven hundred eighty-six thousand, three hundred ninety-four".