20403712 has 40 divisors (see below), whose sum is σ = 46599696. Its totient is φ = 8742912.

The previous prime is 20403709. The next prime is 20403727. The reversal of 20403712 is 21730402.

It is a super-2 number, since 2×20403712² = 832622926757888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20403712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738 + ... + 6430.

Almost surely, 2^20403712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20403712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23299848).

20403712 is an abundant number, since it is smaller than the sum of its proper divisors (26195984).

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

20403712 is an frugal number, since it uses more digits than its factorization.

20403712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718 (or 5702 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20403712 is about 4517.0468228700. The cubic root of 20403712 is about 273.2560135587.

It can be divided in two parts, 20403 and 712, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20403712 in words is "twenty million, four hundred three thousand, seven hundred twelve".