20402402355 has 48 divisors (see below), whose sum is σ = 37651539744. Its totient is φ = 10184555520.

The previous prime is 20402402351. The next prime is 20402402381. The reversal of 20402402355 is 55320420402.

It is a happy number.

20402402355 is a `hidden beast` number, since 20 + 402 + 4 + 0 + 235 + 5 = 666.

It is not a de Polignac number, because 20402402355 - 2² = 20402402351 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20402402351) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64792 + ... + 212138.

It is an arithmetic number, because the mean of its divisors is an integer number (784407078).

Almost surely, 2^20402402355 is an apocalyptic number.

20402402355 is a deficient number, since it is larger than the sum of its proper divisors (17249137389).

20402402355 is a wasteful number, since it uses less digits than its factorization.

20402402355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147556 (or 147553 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 20402402355 its reverse (55320420402), we get a palindrome (75722822757).

The spelling of 20402402355 in words is "twenty billion, four hundred two million, four hundred two thousand, three hundred fifty-five".