20405652025 has 12 divisors (see below), whose sum is σ = 27603282384. Its totient is φ = 14840474000.

The previous prime is 20405651969. The next prime is 20405652061. The reversal of 20405652025 is 52025650402.

It is a happy number.

It is not a de Polignac number, because 20405652025 - 2¹¹ = 20405649977 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 37100911 + ... + 37101460.

It is an arithmetic number, because the mean of its divisors is an integer number (2300273532).

Almost surely, 2^20405652025 is an apocalyptic number.

20405652025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20405652025 is a deficient number, since it is larger than the sum of its proper divisors (7197630359).

20405652025 is a wasteful number, since it uses less digits than its factorization.

20405652025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74202392 (or 74202387 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 20405652025 in words is "twenty billion, four hundred five million, six hundred fifty-two thousand, twenty-five".