20121479 has 8 divisors (see below), whose sum is σ = 23083008. Its totient is φ = 17181720.

The previous prime is 20121467. The next prime is 20121533. The reversal of 20121479 is 97412102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123479) 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, 3407 + ... + 7200.

It is an arithmetic number, because the mean of its divisors is an integer number (2885376).

Almost surely, 2^20121479 is an apocalyptic number.

20121479 is a deficient number, since it is larger than the sum of its proper divisors (2961529).

20121479 is a wasteful number, since it uses less digits than its factorization.

20121479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10885.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20121479 is about 4485.6971587480. The cubic root of 20121479 is about 271.9902272657.

The spelling of 20121479 in words is "twenty million, one hundred twenty-one thousand, four hundred seventy-nine".