20438851853772 has 72 divisors (see below), whose sum is σ = 56363847164352. Its totient is φ = 6193353583200.

The previous prime is 20438851853767. The next prime is 20438851853807. The reversal of 20438851853772 is 27735815883402.

It is a happy number.

20438851853772 is a `hidden beast` number, since 2 + 0 + 4 + 3 + 8 + 85 + 18 + 537 + 7 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9471247 + ... + 11427257.

It is an arithmetic number, because the mean of its divisors is an integer number (782831210616).

Almost surely, 2^{20438851853772} is an apocalyptic number.

20438851853772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20438851853772 is an abundant number, since it is smaller than the sum of its proper divisors (35924995310580).

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

20438851853772 is a wasteful number, since it uses less digits than its factorization.

20438851853772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982419 (or 1982414 counting only the distinct ones).

The product of its (nonzero) digits is 90316800, while the sum is 63.

The spelling of 20438851853772 in words is "twenty trillion, four hundred thirty-eight billion, eight hundred fifty-one million, eight hundred fifty-three thousand, seven hundred seventy-two".