20961415 has 4 divisors (see below), whose sum is σ = 25153704. Its totient is φ = 16769128.

The previous prime is 20961397. The next prime is 20961433. The reversal of 20961415 is 51416902.

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

It is an interprime number because it is at equal distance from previous prime (20961397) and next prime (20961433).

It is a cyclic number.

It is not a de Polignac number, because 20961415 - 2¹³ = 20953223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2096137 + ... + 2096146.

It is an arithmetic number, because the mean of its divisors is an integer number (6288426).

Almost surely, 2^20961415 is an apocalyptic number.

20961415 is a deficient number, since it is larger than the sum of its proper divisors (4192289).

20961415 is an equidigital number, since it uses as much as digits as its factorization.

20961415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192288.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20961415 is about 4578.3637907008. The cubic root of 20961415 is about 275.7233408853.

The spelling of 20961415 in words is "twenty million, nine hundred sixty-one thousand, four hundred fifteen".