20970432 has 126 divisors (see below), whose sum is σ = 70015608. Its totient is φ = 5983488.

The previous prime is 20970407. The next prime is 20970461. The reversal of 20970432 is 23407902.

It is a tau number, because it is divible by the number of its divisors (126).

It is a junction number, because it is equal to n+sod(n) for n = 20970396 and 20970405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 27853 + ... + 28595.

Almost surely, 2^20970432 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 20970432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35007804).

20970432 is an abundant number, since it is smaller than the sum of its proper divisors (49045176).

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

20970432 is a wasteful number, since it uses less digits than its factorization.

20970432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20970432 is about 4579.3484252675. The cubic root of 20970432 is about 275.7628713107.

The spelling of 20970432 in words is "twenty million, nine hundred seventy thousand, four hundred thirty-two".