20621475 has 36 divisors (see below), whose sum is σ = 42215056. Its totient is φ = 9426240.

The previous prime is 20621443. The next prime is 20621519. The reversal of 20621475 is 57412602.

It is not a de Polignac number, because 20621475 - 2⁵ = 20621443 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4972 + ... + 8121.

Almost surely, 2^20621475 is an apocalyptic number.

20621475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20621475 is an abundant number, since it is smaller than the sum of its proper divisors (21593581).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20621475 is a wasteful number, since it uses less digits than its factorization.

20621475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13116 (or 13108 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20621475 is about 4541.0874248356. The cubic root of 20621475 is about 274.2247033431.

The spelling of 20621475 in words is "twenty million, six hundred twenty-one thousand, four hundred seventy-five".