20691148 has 6 divisors (see below), whose sum is σ = 36209516. Its totient is φ = 10345572.

The previous prime is 20691137. The next prime is 20691149. The reversal of 20691148 is 84119602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20691149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2586390 + ... + 2586397.

Almost surely, 2^20691148 is an apocalyptic number.

It is an amenable number.

20691148 is a deficient number, since it is larger than the sum of its proper divisors (15518368).

20691148 is a wasteful number, since it uses less digits than its factorization.

20691148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172791 (or 5172789 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20691148 is about 4548.7523564160. The cubic root of 20691148 is about 274.5331937302.

The spelling of 20691148 in words is "twenty million, six hundred ninety-one thousand, one hundred forty-eight".