20897414961880 has 128 divisors (see below), whose sum is σ = 50266252555200. Its totient is φ = 7791285583872.

The previous prime is 20897414961833. The next prime is 20897414961947. The reversal of 20897414961880 is 8816941479802.

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, 154324284 + ... + 154459636.

Almost surely, 2^{20897414961880} is an apocalyptic number.

20897414961880 is a gapful number since it is divisible by the number (20) 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 20897414961880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25133126277600).

20897414961880 is an abundant number, since it is smaller than the sum of its proper divisors (29368837593320).

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

20897414961880 is a wasteful number, since it uses less digits than its factorization.

20897414961880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137573 (or 137569 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 67.

The spelling of 20897414961880 in words is "twenty trillion, eight hundred ninety-seven billion, four hundred fourteen million, nine hundred sixty-one thousand, eight hundred eighty".