20420121652 has 12 divisors (see below), whose sum is σ = 40840243360. Its totient is φ = 8751480696.

The previous prime is 20420121629. The next prime is 20420121691. The reversal of 20420121652 is 25612102402.

20420121652 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364645002 + ... + 364645057.

Almost surely, 2^20420121652 is an apocalyptic number.

It is an amenable number.

20420121652 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20420121652 is a wasteful number, since it uses less digits than its factorization.

20420121652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729290070 (or 729290068 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 20420121652 in words is "twenty billion, four hundred twenty million, one hundred twenty-one thousand, six hundred fifty-two".