20122491 has 8 divisors (see below), whose sum is σ = 27755280. Its totient is φ = 12952352.

The previous prime is 20122477. The next prime is 20122499. The reversal of 20122491 is 19422102.

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 20122491 - 2¹⁰ = 20121467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20122499) 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, 115560 + ... + 115733.

It is an arithmetic number, because the mean of its divisors is an integer number (3469410).

Almost surely, 2^20122491 is an apocalyptic number.

20122491 is a deficient number, since it is larger than the sum of its proper divisors (7632789).

20122491 is a wasteful number, since it uses less digits than its factorization.

20122491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231325.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20122491 is about 4485.8099603082. The cubic root of 20122491 is about 271.9947870613.

Adding to 20122491 its reverse (19422102), we get a palindrome (39544593).

The spelling of 20122491 in words is "twenty million, one hundred twenty-two thousand, four hundred ninety-one".