20749197 has 72 divisors (see below), whose sum is σ = 37526976. Its totient is φ = 10112256.

The previous prime is 20749187. The next prime is 20749213. The reversal of 20749197 is 79194702.

It is not a de Polignac number, because 20749197 - 2¹¹ = 20747149 is a prime.

It is a super-2 number, since 2×20749197² = 861058352289618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749117) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 902128 + ... + 902150.

It is an arithmetic number, because the mean of its divisors is an integer number (521208).

Almost surely, 2^20749197 is an apocalyptic number.

It is an amenable number.

20749197 is a deficient number, since it is larger than the sum of its proper divisors (16777779).

20749197 is a wasteful number, since it uses less digits than its factorization.

20749197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 20749197 is about 4555.1286480186. The cubic root of 20749197 is about 274.7896882367.

The spelling of 20749197 in words is "twenty million, seven hundred forty-nine thousand, one hundred ninety-seven".