20626340 has 24 divisors (see below), whose sum is σ = 49503552. Its totient is φ = 7071840.

The previous prime is 20626339. The next prime is 20626363. The reversal of 20626340 is 4362602.

20626340 = T₇₉ + T₈₀ + ... + T₄₉₈.

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, 73526 + ... + 73805.

It is an arithmetic number, because the mean of its divisors is an integer number (2062648).

Almost surely, 2^20626340 is an apocalyptic number.

20626340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20626340 is an abundant number, since it is smaller than the sum of its proper divisors (28877212).

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

20626340 is a wasteful number, since it uses less digits than its factorization.

20626340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147347 (or 147345 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20626340 is about 4541.6230578946. The cubic root of 20626340 is about 274.2462665967.

Adding to 20626340 its reverse (4362602), we get a palindrome (24988942).

The spelling of 20626340 in words is "twenty million, six hundred twenty-six thousand, three hundred forty".