20840740725 has 48 divisors (see below), whose sum is σ = 41695509888. Its totient is φ = 8966768640.

The previous prime is 20840740721. The next prime is 20840740763. The reversal of 20840740725 is 52704704802.

It is not a de Polignac number, because 20840740725 - 2² = 20840740721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840740721) 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, 1158624 + ... + 1176473.

It is an arithmetic number, because the mean of its divisors is an integer number (868656456).

Almost surely, 2^20840740725 is an apocalyptic number.

20840740725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20840740725 is an abundant number, since it is smaller than the sum of its proper divisors (20854769163).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20840740725 is a wasteful number, since it uses less digits than its factorization.

20840740725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335134 (or 2335129 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 39.

The spelling of 20840740725 in words is "twenty billion, eight hundred forty million, seven hundred forty thousand, seven hundred twenty-five".