20621436026 has 16 divisors (see below), whose sum is σ = 31710438144. Its totient is φ = 10052958864.

The previous prime is 20621435983. The next prime is 20621436049. The reversal of 20621436026 is 62063412602.

It is a junction number, because it is equal to n+sod(n) for n = 20621435983 and 20621436001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392345 + ... + 441788.

It is an arithmetic number, because the mean of its divisors is an integer number (1981902384).

Almost surely, 2^20621436026 is an apocalyptic number.

20621436026 is a deficient number, since it is larger than the sum of its proper divisors (11089002118).

20621436026 is a wasteful number, since it uses less digits than its factorization.

20621436026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834445.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 20621436026 its reverse (62063412602), we get a palindrome (82684848628).

The spelling of 20621436026 in words is "twenty billion, six hundred twenty-one million, four hundred thirty-six thousand, twenty-six".