20641972 has 24 divisors (see below), whose sum is σ = 39457152. Its totient is φ = 9391200.

The previous prime is 20641969. The next prime is 20641981. The reversal of 20641972 is 27914602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (1644048).

Almost surely, 2^20641972 is an apocalyptic number.

It is an amenable number.

20641972 is a deficient number, since it is larger than the sum of its proper divisors (18815180).

20641972 is a wasteful number, since it uses less digits than its factorization.

20641972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5679 (or 5677 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20641972 is about 4543.3437026049. The cubic root of 20641972 is about 274.3155297347.

The spelling of 20641972 in words is "twenty million, six hundred forty-one thousand, nine hundred seventy-two".