20148987738 has 32 divisors (see below), whose sum is σ = 44350483392. Its totient is φ = 6051718400.

The previous prime is 20148987721. The next prime is 20148987797. The reversal of 20148987738 is 83778984102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1343373 + ... + 1358288.

It is an arithmetic number, because the mean of its divisors is an integer number (1385952606).

Almost surely, 2^20148987738 is an apocalyptic number.

20148987738 is an abundant number, since it is smaller than the sum of its proper divisors (24201495654).

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

20148987738 is a wasteful number, since it uses less digits than its factorization.

20148987738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701790.

The product of its (nonzero) digits is 5419008, while the sum is 57.

The spelling of 20148987738 in words is "twenty billion, one hundred forty-eight million, nine hundred eighty-seven thousand, seven hundred thirty-eight".