20402023555 has 8 divisors (see below), whose sum is σ = 24484982544. Its totient is φ = 16319916000.

The previous prime is 20402023511. The next prime is 20402023559. The reversal of 20402023555 is 55532020402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20402023555 - 2¹⁵ = 20401990787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402023559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158896 + ... + 257005.

It is an arithmetic number, because the mean of its divisors is an integer number (3060622818).

Almost surely, 2^20402023555 is an apocalyptic number.

20402023555 is a deficient number, since it is larger than the sum of its proper divisors (4082958989).

20402023555 is an equidigital number, since it uses as much as digits as its factorization.

20402023555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425717.

The product of its (nonzero) digits is 12000, while the sum is 28.

Adding to 20402023555 its reverse (55532020402), we get a palindrome (75934043957).

The spelling of 20402023555 in words is "twenty billion, four hundred two million, twenty-three thousand, five hundred fifty-five".