20121787392 has 352 divisors, whose sum is σ = 64191823872. Its totient is φ = 5484036096.

The previous prime is 20121787369. The next prime is 20121787403. The reversal of 20121787392 is 29378712102.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43459353 + ... + 43459815.

It is an arithmetic number, because the mean of its divisors is an integer number (182363136).

Almost surely, 2^20121787392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121787392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32095911936).

20121787392 is an abundant number, since it is smaller than the sum of its proper divisors (44070036480).

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

20121787392 is a wasteful number, since it uses less digits than its factorization.

20121787392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 20121787392 in words is "twenty billion, one hundred twenty-one million, seven hundred eighty-seven thousand, three hundred ninety-two".