20460021505 has 32 divisors (see below), whose sum is σ = 30650980608. Its totient is φ = 12737356800.

The previous prime is 20460021499. The next prime is 20460021521. The reversal of 20460021505 is 50512006402.

It is not a de Polignac number, because 20460021505 - 2⁹ = 20460020993 is a prime.

It is a super-2 number, since 2×20460021505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20460021505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258069 + ... + 327901.

It is an arithmetic number, because the mean of its divisors is an integer number (957843144).

Almost surely, 2^20460021505 is an apocalyptic number.

It is an amenable number.

20460021505 is a deficient number, since it is larger than the sum of its proper divisors (10190959103).

20460021505 is a wasteful number, since it uses less digits than its factorization.

20460021505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70617.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20460021505 its reverse (50512006402), we get a palindrome (70972027907).

The spelling of 20460021505 in words is "twenty billion, four hundred sixty million, twenty-one thousand, five hundred five".