20639476 has 24 divisors (see below), whose sum is σ = 42434784. Its totient is φ = 8659680.

The previous prime is 20639471. The next prime is 20639483. The reversal of 20639476 is 67493602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639471) 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, 17470 + ... + 18613.

It is an arithmetic number, because the mean of its divisors is an integer number (1768116).

Almost surely, 2^20639476 is an apocalyptic number.

20639476 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20639476 is an abundant number, since it is smaller than the sum of its proper divisors (21795308).

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

20639476 is a wasteful number, since it uses less digits than its factorization.

20639476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36111 (or 36109 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 20639476 is about 4543.0690067398. The cubic root of 20639476 is about 274.3044726651.

It can be divided in two parts, 20639 and 476, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20639476 in words is "twenty million, six hundred thirty-nine thousand, four hundred seventy-six".