20928501 has 24 divisors (see below), whose sum is σ = 33190560. Its totient is φ = 12602400.

The previous prime is 20928499. The next prime is 20928511. The reversal of 20928501 is 10582902.

It is not a de Polignac number, because 20928501 - 2¹ = 20928499 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20928511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17131 + ... + 18311.

It is an arithmetic number, because the mean of its divisors is an integer number (1382940).

Almost surely, 2^20928501 is an apocalyptic number.

It is an amenable number.

20928501 is a deficient number, since it is larger than the sum of its proper divisors (12262059).

20928501 is a wasteful number, since it uses less digits than its factorization.

20928501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20928501 is about 4574.7678629631. The cubic root of 20928501 is about 275.5789499940.

The spelling of 20928501 in words is "twenty million, nine hundred twenty-eight thousand, five hundred one".