20948731 has 8 divisors (see below), whose sum is σ = 21381840. Its totient is φ = 20520192.

The previous prime is 20948729. The next prime is 20948747. The reversal of 20948731 is 13784902.

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

It is a cyclic number.

It is not a de Polignac number, because 20948731 - 2¹ = 20948729 is a prime.

It is a super-2 number, since 2×20948731² = 877698661020722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20948231) 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, 9016 + ... + 11098.

It is an arithmetic number, because the mean of its divisors is an integer number (2672730).

Almost surely, 2^20948731 is an apocalyptic number.

20948731 is a deficient number, since it is larger than the sum of its proper divisors (433109).

20948731 is a wasteful number, since it uses less digits than its factorization.

20948731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20948731 is about 4576.9783700603. The cubic root of 20948731 is about 275.6677151796.

The spelling of 20948731 in words is "twenty million, nine hundred forty-eight thousand, seven hundred thirty-one".