20621477 has 8 divisors (see below), whose sum is σ = 21046272. Its totient is φ = 20199600.

The previous prime is 20621443. The next prime is 20621519. The reversal of 20621477 is 77412602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20621477 - 2⁶ = 20621413 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 (20621077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18428 + ... + 19514.

It is an arithmetic number, because the mean of its divisors is an integer number (2630784).

Almost surely, 2^20621477 is an apocalyptic number.

It is an amenable number.

20621477 is a deficient number, since it is larger than the sum of its proper divisors (424795).

20621477 is a wasteful number, since it uses less digits than its factorization.

20621477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20621477 is about 4541.0876450472. The cubic root of 20621477 is about 274.2247122085.

The spelling of 20621477 in words is "twenty million, six hundred twenty-one thousand, four hundred seventy-seven".