20265138124 has 24 divisors (see below), whose sum is σ = 44214847488. Its totient is φ = 7895508240.

The previous prime is 20265138077. The next prime is 20265138197. The reversal of 20265138124 is 42183156202.

It is a self number, because there is not a number n which added to its sum of digits gives 20265138124.

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, 32897644 + ... + 32898259.

It is an arithmetic number, because the mean of its divisors is an integer number (1842285312).

Almost surely, 2^20265138124 is an apocalyptic number.

It is an amenable number.

20265138124 is an abundant number, since it is smaller than the sum of its proper divisors (23949709364).

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

20265138124 is a wasteful number, since it uses less digits than its factorization.

20265138124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65795925 (or 65795923 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 20265138124 in words is "twenty billion, two hundred sixty-five million, one hundred thirty-eight thousand, one hundred twenty-four".