20972898 has 32 divisors (see below), whose sum is σ = 47377920. Its totient is φ = 6875280.

The previous prime is 20972873. The next prime is 20972899. The reversal of 20972898 is 89827902.

It is not an unprimeable number, because it can be changed into a prime (20972899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111 + ... + 6477.

It is an arithmetic number, because the mean of its divisors is an integer number (1480560).

Almost surely, 2^20972898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20972898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23688960).

20972898 is an abundant number, since it is smaller than the sum of its proper divisors (26405022).

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

20972898 is a wasteful number, since it uses less digits than its factorization.

20972898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6439 (or 6433 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 20972898 is about 4579.6176696314. The cubic root of 20972898 is about 275.7736802532.

The spelling of 20972898 in words is "twenty million, nine hundred seventy-two thousand, eight hundred ninety-eight".