20981123 has 8 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 20194048.

The previous prime is 20981101. The next prime is 20981131. The reversal of 20981123 is 32118902.

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 20981123 - 2⁸ = 20980867 is a prime.

It is a super-2 number, since 2×20981123² = 880415044682258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20981092 and 20981101.

It is not an unprimeable number, because it can be changed into a prime (20981143) 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, 10163 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (2721600).

Almost surely, 2^20981123 is an apocalyptic number.

20981123 is a deficient number, since it is larger than the sum of its proper divisors (791677).

20981123 is a wasteful number, since it uses less digits than its factorization.

20981123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20981123 is about 4580.5155823335. The cubic root of 20981123 is about 275.8097258532.

The spelling of 20981123 in words is "twenty million, nine hundred eighty-one thousand, one hundred twenty-three".