20473551 has 12 divisors (see below), whose sum is σ = 33797712. Its totient is φ = 11699136.

The previous prime is 20473549. The next prime is 20473553. The reversal of 20473551 is 15537402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20473549) and next prime (20473553).

It is not a de Polignac number, because 20473551 - 2¹ = 20473549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20473553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162426 + ... + 162551.

It is an arithmetic number, because the mean of its divisors is an integer number (2816476).

Almost surely, 2^20473551 is an apocalyptic number.

20473551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20473551 is a deficient number, since it is larger than the sum of its proper divisors (13324161).

20473551 is a wasteful number, since it uses less digits than its factorization.

20473551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324990 (or 324987 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20473551 is about 4524.7708229257. The cubic root of 20473551 is about 273.5674306542.

The spelling of 20473551 in words is "twenty million, four hundred seventy-three thousand, five hundred fifty-one".