20897388 has 36 divisors (see below), whose sum is σ = 53107600. Its totient is φ = 6928416.

The previous prime is 20897377. The next prime is 20897411. The reversal of 20897388 is 88379802.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5706 + ... + 8622.

Almost surely, 2^20897388 is an apocalyptic number.

It is an amenable number.

20897388 is an abundant number, since it is smaller than the sum of its proper divisors (32210212).

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

20897388 is a wasteful number, since it uses less digits than its factorization.

20897388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126 (or 3121 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 20897388 is about 4571.3660977874. The cubic root of 20897388 is about 275.4423206797.

The spelling of 20897388 in words is "twenty million, eight hundred ninety-seven thousand, three hundred eighty-eight".