20621629 has 8 divisors (see below), whose sum is σ = 24954048. Its totient is φ = 16635840.

The previous prime is 20621609. The next prime is 20621677. The reversal of 20621629 is 92612602.

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 20621629 - 2⁵ = 20621597 is a prime.

It is a super-2 number, since 2×20621629² = 850503165227282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20621597 and 20621606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621609) 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, 86527 + ... + 86764.

It is an arithmetic number, because the mean of its divisors is an integer number (3119256).

Almost surely, 2^20621629 is an apocalyptic number.

It is an amenable number.

20621629 is a deficient number, since it is larger than the sum of its proper divisors (4332419).

20621629 is a wasteful number, since it uses less digits than its factorization.

20621629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173315.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20621629 is about 4541.1043810950. The cubic root of 20621629 is about 274.2253859729.

The spelling of 20621629 in words is "twenty million, six hundred twenty-one thousand, six hundred twenty-nine".