20898015 has 16 divisors (see below), whose sum is σ = 35404128. Its totient is φ = 10489856.

The previous prime is 20897993. The next prime is 20898041. The reversal of 20898015 is 51089802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20898015 - 2⁵ = 20897983 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40722 + ... + 41231.

It is an arithmetic number, because the mean of its divisors is an integer number (2212758).

Almost surely, 2^20898015 is an apocalyptic number.

20898015 is a deficient number, since it is larger than the sum of its proper divisors (14506113).

20898015 is a wasteful number, since it uses less digits than its factorization.

20898015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81978.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20898015 is about 4571.4346763352. The cubic root of 20898015 is about 275.4450754196.

The spelling of 20898015 in words is "twenty million, eight hundred ninety-eight thousand, fifteen".