20961477 has 16 divisors (see below), whose sum is σ = 31303680. Its totient is φ = 13862016.

The previous prime is 20961467. The next prime is 20961517. The reversal of 20961477 is 77416902.

It is a happy number.

It is not a de Polignac number, because 20961477 - 2¹⁰ = 20960453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20961467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373 + ... + 6485.

It is an arithmetic number, because the mean of its divisors is an integer number (1956480).

Almost surely, 2^20961477 is an apocalyptic number.

20961477 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20961477 is a deficient number, since it is larger than the sum of its proper divisors (10342203).

20961477 is a wasteful number, since it uses less digits than its factorization.

20961477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249 (or 6243 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20961477 is about 4578.3705616737. The cubic root of 20961477 is about 275.7236127313.

The spelling of 20961477 in words is "twenty million, nine hundred sixty-one thousand, four hundred seventy-seven".