20251563384 has 96 divisors (see below), whose sum is σ = 55439996400. Its totient is φ = 6161126400.

The previous prime is 20251563341. The next prime is 20251563403. The reversal of 20251563384 is 48336515202.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 332934 + ... + 389034.

Almost surely, 2^20251563384 is an apocalyptic number.

20251563384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20251563384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27719998200).

20251563384 is an abundant number, since it is smaller than the sum of its proper divisors (35188433016).

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

20251563384 is a wasteful number, since it uses less digits than its factorization.

20251563384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56225 (or 56208 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 20251563384 in words is "twenty billion, two hundred fifty-one million, five hundred sixty-three thousand, three hundred eighty-four".