20926945 has 16 divisors (see below), whose sum is σ = 27214992. Its totient is φ = 15356160.

The previous prime is 20926943. The next prime is 20926957. The reversal of 20926945 is 54962902.

It can be written as a sum of positive squares in 8 ways, for example, as 3211264 + 17715681 = 1792^2 + 4209^2 .

It is not a de Polignac number, because 20926945 - 2¹ = 20926943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20926943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10315 + ... + 12175.

It is an arithmetic number, because the mean of its divisors is an integer number (1700937).

Almost surely, 2^20926945 is an apocalyptic number.

It is an amenable number.

20926945 is a deficient number, since it is larger than the sum of its proper divisors (6288047).

20926945 is a wasteful number, since it uses less digits than its factorization.

20926945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 20926945 is about 4574.5977965281. The cubic root of 20926945 is about 275.5721202092.

The spelling of 20926945 in words is "twenty million, nine hundred twenty-six thousand, nine hundred forty-five".