20402201505 has 16 divisors (see below), whose sum is σ = 37306882944. Its totient is φ = 9326720640.

The previous prime is 20402201453. The next prime is 20402201513. The reversal of 20402201505 is 50510220402.

It is a happy number.

It is not a de Polignac number, because 20402201505 - 2¹⁸ = 20401939361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97153236 + ... + 97153445.

It is an arithmetic number, because the mean of its divisors is an integer number (2331680184).

Almost surely, 2^20402201505 is an apocalyptic number.

It is an amenable number.

20402201505 is a deficient number, since it is larger than the sum of its proper divisors (16904681439).

20402201505 is a wasteful number, since it uses less digits than its factorization.

20402201505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194306696.

The product of its (nonzero) digits is 800, while the sum is 21.

Adding to 20402201505 its reverse (50510220402), we get a palindrome (70912421907).

The spelling of 20402201505 in words is "twenty billion, four hundred two million, two hundred one thousand, five hundred five".