20756131 has 8 divisors (see below), whose sum is σ = 22981824. Its totient is φ = 18586920.

The previous prime is 20756129. The next prime is 20756137. The reversal of 20756131 is 13165702.

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

It is not a de Polignac number, because 20756131 - 2¹ = 20756129 is a prime.

It is a super-2 number, since 2×20756131² = 861633948178322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20756096 and 20756105.

It is not an unprimeable number, because it can be changed into a prime (20756137) 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, 13345 + ... + 14818.

It is an arithmetic number, because the mean of its divisors is an integer number (2872728).

Almost surely, 2^20756131 is an apocalyptic number.

20756131 is a deficient number, since it is larger than the sum of its proper divisors (2225693).

20756131 is a wasteful number, since it uses less digits than its factorization.

20756131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28241.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20756131 is about 4555.8897045473. The cubic root of 20756131 is about 274.8202947141.

The spelling of 20756131 in words is "twenty million, seven hundred fifty-six thousand, one hundred thirty-one".