20986401 has 16 divisors (see below), whose sum is σ = 29064960. Its totient is φ = 13453440.

The previous prime is 20986397. The next prime is 20986403. The reversal of 20986401 is 10468902.

It is not a de Polignac number, because 20986401 - 2² = 20986397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20986403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40021 + ... + 40541.

It is an arithmetic number, because the mean of its divisors is an integer number (1816560).

Almost surely, 2^20986401 is an apocalyptic number.

It is an amenable number.

20986401 is a deficient number, since it is larger than the sum of its proper divisors (8078559).

20986401 is a wasteful number, since it uses less digits than its factorization.

20986401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20986401 is about 4581.0916821212. The cubic root of 20986401 is about 275.8328514295.

The spelling of 20986401 in words is "twenty million, nine hundred eighty-six thousand, four hundred one".