20769228 has 36 divisors (see below), whose sum is σ = 52638768. Its totient is φ = 6904800.

The previous prime is 20769211. The next prime is 20769233. The reversal of 20769228 is 82296702.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20769192 and 20769201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24825 + ... + 25647.

It is an arithmetic number, because the mean of its divisors is an integer number (1462188).

Almost surely, 2^20769228 is an apocalyptic number.

It is an amenable number.

20769228 is an abundant number, since it is smaller than the sum of its proper divisors (31869540).

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

20769228 is a wasteful number, since it uses less digits than its factorization.

20769228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20769228 is about 4557.3268480547. The cubic root of 20769228 is about 274.8780859054.

The spelling of 20769228 in words is "twenty million, seven hundred sixty-nine thousand, two hundred twenty-eight".