20972196 has 90 divisors (see below), whose sum is σ = 63824838. Its totient is φ = 5987520.

The previous prime is 20972179. The next prime is 20972221. The reversal of 20972196 is 69127902.

20972196 = T₂₈₈ + T₂₈₉ + ... + T₅₃₀.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 396900 = 4536^2 + 630^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20972196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 15216 + ... + 16536.

Almost surely, 2^20972196 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 20972196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31912419).

20972196 is an abundant number, since it is smaller than the sum of its proper divisors (42852642).

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

20972196 is a wasteful number, since it uses less digits than its factorization.

20972196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 20972196 is about 4579.5410250373. The cubic root of 20972196 is about 275.7706033413.

The spelling of 20972196 in words is "twenty million, nine hundred seventy-two thousand, one hundred ninety-six".