20101279 has 4 divisors (see below), whose sum is σ = 21928680. Its totient is φ = 18273880.

The previous prime is 20101261. The next prime is 20101283. The reversal of 20101279 is 97210102.

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 20101279 - 2⁵ = 20101247 is a prime.

It is a super-2 number, since 2×20101279² = 808122834871682, 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 (20101219) 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, 913684 + ... + 913705.

It is an arithmetic number, because the mean of its divisors is an integer number (5482170).

Almost surely, 2^20101279 is an apocalyptic number.

20101279 is a deficient number, since it is larger than the sum of its proper divisors (1827401).

20101279 is a wasteful number, since it uses less digits than its factorization.

20101279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827400.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20101279 is about 4483.4449924138. Note that the first 3 decimals coincide. The cubic root of 20101279 is about 271.8991795820.

The spelling of 20101279 in words is "twenty million, one hundred one thousand, two hundred seventy-nine".