20853477 has 16 divisors (see below), whose sum is σ = 31553280. Its totient is φ = 13605696.

The previous prime is 20853473. The next prime is 20853493. The reversal of 20853477 is 77435802.

It is not a de Polignac number, because 20853477 - 2² = 20853473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853473) 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, 6948 + ... + 9485.

It is an arithmetic number, because the mean of its divisors is an integer number (1972080).

Almost surely, 2^20853477 is an apocalyptic number.

20853477 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20853477 is a deficient number, since it is larger than the sum of its proper divisors (10699803).

20853477 is a wasteful number, since it uses less digits than its factorization.

20853477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16489 (or 16483 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 20853477 is about 4566.5607408640. The cubic root of 20853477 is about 275.2492594030.

The spelling of 20853477 in words is "twenty million, eight hundred fifty-three thousand, four hundred seventy-seven".