19970477 has 4 divisors (see below), whose sum is σ = 19987260. Its totient is φ = 19953696.

The previous prime is 19970471. The next prime is 19970507. The reversal of 19970477 is 77407991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77407991 = 331 ⋅233861.

It can be written as a sum of positive squares in 2 ways, for example, as 7678441 + 12292036 = 2771^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 19970477 - 2⁶ = 19970413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19970471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6458 + ... + 9035.

It is an arithmetic number, because the mean of its divisors is an integer number (4996815).

Almost surely, 2^19970477 is an apocalyptic number.

It is an amenable number.

19970477 is a deficient number, since it is larger than the sum of its proper divisors (16783).

19970477 is a wasteful number, since it uses less digits than its factorization.

19970477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16782.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 19970477 is about 4468.8339642462. The cubic root of 19970477 is about 271.3081329671.

The spelling of 19970477 in words is "nineteen million, nine hundred seventy thousand, four hundred seventy-seven".