20509854 has 48 divisors (see below), whose sum is σ = 45921168. Its totient is φ = 6084864.

The previous prime is 20509843. The next prime is 20509891. The reversal of 20509854 is 45890502.

It is a super-2 number, since 2×20509854² = 841308222202632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36544 + ... + 37100.

It is an arithmetic number, because the mean of its divisors is an integer number (956691).

Almost surely, 2^20509854 is an apocalyptic number.

20509854 is an abundant number, since it is smaller than the sum of its proper divisors (25411314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20509854 is a wasteful number, since it uses less digits than its factorization.

20509854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 20509854 is about 4528.7806305892. The cubic root of 20509854 is about 273.7290286472.

The spelling of 20509854 in words is "twenty million, five hundred nine thousand, eight hundred fifty-four".