20957948 has 12 divisors (see below), whose sum is σ = 40010712. Its totient is φ = 9526320.

The previous prime is 20957941. The next prime is 20958001. The reversal of 20957948 is 84975902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 476317 = 20957948 / (2 + 0 + 9 + 5 + 7 + 9 + 4 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 20957899 and 20957908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238115 + ... + 238202.

It is an arithmetic number, because the mean of its divisors is an integer number (3334226).

Almost surely, 2^20957948 is an apocalyptic number.

It is an amenable number.

20957948 is a deficient number, since it is larger than the sum of its proper divisors (19052764).

20957948 is a wasteful number, since it uses less digits than its factorization.

20957948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476332 (or 476330 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 20957948 is about 4577.9851463280. The cubic root of 20957948 is about 275.7081385794.

The spelling of 20957948 in words is "twenty million, nine hundred fifty-seven thousand, nine hundred forty-eight".