20751879 has 4 divisors (see below), whose sum is σ = 27669176. Its totient is φ = 13834584.

The previous prime is 20751877. The next prime is 20751881. The reversal of 20751879 is 97815702.

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

It is an interprime number because it is at equal distance from previous prime (20751877) and next prime (20751881).

It is not a de Polignac number, because 20751879 - 2¹ = 20751877 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 (20751877) 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, 3458644 + ... + 3458649.

It is an arithmetic number, because the mean of its divisors is an integer number (6917294).

Almost surely, 2^20751879 is an apocalyptic number.

20751879 is a deficient number, since it is larger than the sum of its proper divisors (6917297).

20751879 is an equidigital number, since it uses as much as digits as its factorization.

20751879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6917296.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 20751879 is about 4555.4230319477. The cubic root of 20751879 is about 274.8015273164.

The spelling of 20751879 in words is "twenty million, seven hundred fifty-one thousand, eight hundred seventy-nine".