20891299415028 has 24 divisors (see below), whose sum is σ = 55710131773632. Its totient is φ = 5968942689984.

The previous prime is 20891299415027. The next prime is 20891299415039. The reversal of 20891299415028 is 82051499219802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20891299415023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124352972625 + ... + 124352972792.

It is an arithmetic number, because the mean of its divisors is an integer number (2321255490568).

Almost surely, 2^{20891299415028} is an apocalyptic number.

20891299415028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20891299415028 is an abundant number, since it is smaller than the sum of its proper divisors (34818832358604).

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

20891299415028 is a wasteful number, since it uses less digits than its factorization.

20891299415028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248705945431 (or 248705945429 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 60.

The spelling of 20891299415028 in words is "twenty trillion, eight hundred ninety-one billion, two hundred ninety-nine million, four hundred fifteen thousand, twenty-eight".