20705388 has 48 divisors (see below), whose sum is σ = 55810944. Its totient is φ = 5904640.

The previous prime is 20705387. The next prime is 20705407. The reversal of 20705388 is 88350702.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20705381) 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, 2370 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (1162728).

Almost surely, 2^20705388 is an apocalyptic number.

It is an amenable number.

20705388 is an abundant number, since it is smaller than the sum of its proper divisors (35105556).

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

20705388 is a wasteful number, since it uses less digits than its factorization.

20705388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9262 (or 9260 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20705388 is about 4550.3173515701. The cubic root of 20705388 is about 274.5961587591.

The spelling of 20705388 in words is "twenty million, seven hundred five thousand, three hundred eighty-eight".