20854491 has 16 divisors (see below), whose sum is σ = 33160704. Its totient is φ = 11398464.

The previous prime is 20854469. The next prime is 20854523. The reversal of 20854491 is 19445802.

It is not a de Polignac number, because 20854491 - 2¹⁷ = 20723419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20854411) 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, 21106 + ... + 22071.

It is an arithmetic number, because the mean of its divisors is an integer number (2072544).

Almost surely, 2^20854491 is an apocalyptic number.

20854491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20854491 is a deficient number, since it is larger than the sum of its proper divisors (12306213).

20854491 is a wasteful number, since it uses less digits than its factorization.

20854491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43210.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20854491 is about 4566.6717639874. The cubic root of 20854491 is about 275.2537206610.

The spelling of 20854491 in words is "twenty million, eight hundred fifty-four thousand, four hundred ninety-one".