20298961 has 4 divisors (see below), whose sum is σ = 20485300. Its totient is φ = 20112624.

The previous prime is 20298953. The next prime is 20298979. The reversal of 20298961 is 16989202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9859600 + 10439361 = 3140^2 + 3231^2 .

It is a cyclic number.

It is not a de Polignac number, because 20298961 - 2³ = 20298953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20298961.

It is not an unprimeable number, because it can be changed into a prime (20298911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93006 + ... + 93223.

It is an arithmetic number, because the mean of its divisors is an integer number (5121325).

Almost surely, 2^20298961 is an apocalyptic number.

It is an amenable number.

20298961 is a deficient number, since it is larger than the sum of its proper divisors (186339).

20298961 is a wasteful number, since it uses less digits than its factorization.

20298961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186338.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 20298961 is about 4505.4368267683. The cubic root of 20298961 is about 272.7875862937.

The spelling of 20298961 in words is "twenty million, two hundred ninety-eight thousand, nine hundred sixty-one".