20840753436 has 24 divisors (see below), whose sum is σ = 49100548224. Its totient is φ = 6879471600.

The previous prime is 20840753411. The next prime is 20840753473. The reversal of 20840753436 is 63435704802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8429490 + ... + 8431961.

It is an arithmetic number, because the mean of its divisors is an integer number (2045856176).

Almost surely, 2^20840753436 is an apocalyptic number.

It is an amenable number.

20840753436 is an abundant number, since it is smaller than the sum of its proper divisors (28259794788).

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

20840753436 is a wasteful number, since it uses less digits than its factorization.

20840753436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16861561 (or 16861559 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 20840753436 in words is "twenty billion, eight hundred forty million, seven hundred fifty-three thousand, four hundred thirty-six".