20621363 has 16 divisors (see below), whose sum is σ = 24729600. Its totient is φ = 16812576.

The previous prime is 20621351. The next prime is 20621413. The reversal of 20621363 is 36312602.

It is a cyclic number.

It is not a de Polignac number, because 20621363 - 2⁶ = 20621299 is a prime.

It is a super-2 number, since 2×20621363² = 850481223955538, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (20621333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56006 + ... + 56372.

It is an arithmetic number, because the mean of its divisors is an integer number (1545600).

Almost surely, 2^20621363 is an apocalyptic number.

20621363 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20621363 is a deficient number, since it is larger than the sum of its proper divisors (4108237).

20621363 is a wasteful number, since it uses less digits than its factorization.

20621363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20621363 is about 4541.0750929708. The cubic root of 20621363 is about 274.2242068830.

Adding to 20621363 its reverse (36312602), we get a palindrome (56933965).

The spelling of 20621363 in words is "twenty million, six hundred twenty-one thousand, three hundred sixty-three".