20939464 has 64 divisors (see below), whose sum is σ = 49392000. Its totient is φ = 8269632.

The previous prime is 20939459. The next prime is 20939473. The reversal of 20939464 is 46493902.

It is a super-2 number, since 2×20939464² = 876922305214592, 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 15 ways as a sum of consecutive naturals, for example, 35379 + ... + 35965.

It is an arithmetic number, because the mean of its divisors is an integer number (771750).

Almost surely, 2^20939464 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 20939464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24696000).

20939464 is an abundant number, since it is smaller than the sum of its proper divisors (28452536).

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

20939464 is a wasteful number, since it uses less digits than its factorization.

20939464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20939464 is about 4575.9659089639. The cubic root of 20939464 is about 275.6270605372.

The spelling of 20939464 in words is "twenty million, nine hundred thirty-nine thousand, four hundred sixty-four".