20155220404 has 12 divisors (see below), whose sum is σ = 38478148128. Its totient is φ = 9161463800.

The previous prime is 20155220401. The next prime is 20155220443. The reversal of 20155220404 is 40402255102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155220401) 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, 229036552 + ... + 229036639.

It is an arithmetic number, because the mean of its divisors is an integer number (3206512344).

Almost surely, 2^20155220404 is an apocalyptic number.

It is an amenable number.

20155220404 is a deficient number, since it is larger than the sum of its proper divisors (18322927724).

20155220404 is a wasteful number, since it uses less digits than its factorization.

20155220404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458073206 (or 458073204 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 20155220404 its reverse (40402255102), we get a palindrome (60557475506).

The spelling of 20155220404 in words is "twenty billion, one hundred fifty-five million, two hundred twenty thousand, four hundred four".