20477943 has 6 divisors (see below), whose sum is σ = 29579264. Its totient is φ = 13651956.

The previous prime is 20477929. The next prime is 20477957. The reversal of 20477943 is 34977402.

It is an interprime number because it is at equal distance from previous prime (20477929) and next prime (20477957).

It is not a de Polignac number, because 20477943 - 2⁴ = 20477927 is a prime.

It is a super-2 number, since 2×20477943² = 838692299022498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20477898 and 20477907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20477903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1137655 + ... + 1137672.

Almost surely, 2^20477943 is an apocalyptic number.

20477943 is a deficient number, since it is larger than the sum of its proper divisors (9101321).

20477943 is a wasteful number, since it uses less digits than its factorization.

20477943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275333 (or 2275330 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 20477943 is about 4525.2561253480. The cubic root of 20477943 is about 273.5869912123.

The spelling of 20477943 in words is "twenty million, four hundred seventy-seven thousand, nine hundred forty-three".