20880387 has 12 divisors (see below), whose sum is σ = 32902584. Its totient is φ = 12654720.

The previous prime is 20880371. The next prime is 20880397. The reversal of 20880387 is 78308802.

It is not a de Polignac number, because 20880387 - 2⁴ = 20880371 is a prime.

It is a super-2 number, since 2×20880387² = 871981122539538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20880347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105358 + ... + 105555.

It is an arithmetic number, because the mean of its divisors is an integer number (2741882).

Almost surely, 2^20880387 is an apocalyptic number.

20880387 is a deficient number, since it is larger than the sum of its proper divisors (12022197).

20880387 is a wasteful number, since it uses less digits than its factorization.

20880387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210930 (or 210927 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 20880387 is about 4569.5062096467. The cubic root of 20880387 is about 275.3676053555.

The spelling of 20880387 in words is "twenty million, eight hundred eighty thousand, three hundred eighty-seven".