18020581396 has 6 divisors (see below), whose sum is σ = 31536017450. Its totient is φ = 9010290696.

The previous prime is 18020581373. The next prime is 18020581429. The reversal of 18020581396 is 69318502081.

It can be written as a sum of positive squares in only one way, i.e., 9626356996 + 8394224400 = 98114^2 + 91620^2 .

It is a super-2 number, since 2×18020581396² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2252572671 + ... + 2252572678.

Almost surely, 2^18020581396 is an apocalyptic number.

It is an amenable number.

18020581396 is a deficient number, since it is larger than the sum of its proper divisors (13515436054).

18020581396 is a wasteful number, since it uses less digits than its factorization.

18020581396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505145353 (or 4505145351 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 18020581396 in words is "eighteen billion, twenty million, five hundred eighty-one thousand, three hundred ninety-six".