20144879 has 4 divisors (see below), whose sum is σ = 20839560. Its totient is φ = 19450200.

The previous prime is 20144869. The next prime is 20144903. The reversal of 20144879 is 97844102.

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

It is a cyclic number.

It is not a de Polignac number, because 20144879 - 2¹⁶ = 20079343 is a prime.

It is a super-2 number, since 2×20144879² = 811632299849282, 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 (20144809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347297 + ... + 347354.

It is an arithmetic number, because the mean of its divisors is an integer number (5209890).

Almost surely, 2^20144879 is an apocalyptic number.

20144879 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20144879 is a deficient number, since it is larger than the sum of its proper divisors (694681).

20144879 is an equidigital number, since it uses as much as digits as its factorization.

20144879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694680.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20144879 is about 4488.3046910833. The cubic root of 20144879 is about 272.0956221973.

The spelling of 20144879 in words is "twenty million, one hundred forty-four thousand, eight hundred seventy-nine".