20853720 has 64 divisors (see below), whose sum is σ = 69516000. Its totient is φ = 5560704.

The previous prime is 20853719. The next prime is 20853757. The reversal of 20853720 is 2735802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8575 + ... + 10734.

Almost surely, 2^20853720 is an apocalyptic number.

20853720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20853720 is an abundant number, since it is smaller than the sum of its proper divisors (48662280).

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

20853720 is a wasteful number, since it uses less digits than its factorization.

20853720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19329 (or 19319 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20853720 is about 4566.5873472430. The cubic root of 20853720 is about 275.2503285342.

The spelling of 20853720 in words is "twenty million, eight hundred fifty-three thousand, seven hundred twenty".