20914557 has 16 divisors (see below), whose sum is σ = 28359552. Its totient is φ = 13708800.

The previous prime is 20914547. The next prime is 20914559. The reversal of 20914557 is 75541902.

It is not a de Polignac number, because 20914557 - 2¹⁰ = 20913533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20914559) 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, 61893 + ... + 62229.

It is an arithmetic number, because the mean of its divisors is an integer number (1772472).

Almost surely, 2^20914557 is an apocalyptic number.

It is an amenable number.

20914557 is a deficient number, since it is larger than the sum of its proper divisors (7444995).

20914557 is a wasteful number, since it uses less digits than its factorization.

20914557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 20914557 is about 4573.2435972732. The cubic root of 20914557 is about 275.5177332094.

The spelling of 20914557 in words is "twenty million, nine hundred fourteen thousand, five hundred fifty-seven".