20861427 has 8 divisors (see below), whose sum is σ = 27940864. Its totient is φ = 13844808.

The previous prime is 20861417. The next prime is 20861441. The reversal of 20861427 is 72416802.

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

It is not a de Polignac number, because 20861427 - 2¹⁰ = 20860403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20861394 and 20861403.

It is not an unprimeable number, because it can be changed into a prime (20861417) 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, 14923 + ... + 16260.

It is an arithmetic number, because the mean of its divisors is an integer number (3492608).

Almost surely, 2^20861427 is an apocalyptic number.

20861427 is a deficient number, since it is larger than the sum of its proper divisors (7079437).

20861427 is a wasteful number, since it uses less digits than its factorization.

20861427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31409.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20861427 is about 4567.4311160651. The cubic root of 20861427 is about 275.2842328449.

The spelling of 20861427 in words is "twenty million, eight hundred sixty-one thousand, four hundred twenty-seven".