20995501 has 8 divisors (see below), whose sum is σ = 21266784. Its totient is φ = 20726160.

The previous prime is 20995489. The next prime is 20995517. The reversal of 20995501 is 10559902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20995501 - 2⁹ = 20994989 is a prime.

It is a super-2 number, since 2×20995501² = 881622124482002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20995571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38110 + ... + 38656.

It is an arithmetic number, because the mean of its divisors is an integer number (2658348).

Almost surely, 2^20995501 is an apocalyptic number.

It is an amenable number.

20995501 is a deficient number, since it is larger than the sum of its proper divisors (271283).

20995501 is a wasteful number, since it uses less digits than its factorization.

20995501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 20995501 is about 4582.0847875176. The cubic root of 20995501 is about 275.8727140089.

The spelling of 20995501 in words is "twenty million, nine hundred ninety-five thousand, five hundred one".