20429608 has 8 divisors (see below), whose sum is σ = 38305530. Its totient is φ = 10214800.

The previous prime is 20429599. The next prime is 20429621. The reversal of 20429608 is 80692402.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 161604 = 4502^2 + 402^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20429608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1276843 + ... + 1276858.

Almost surely, 2^20429608 is an apocalyptic number.

It is an amenable number.

20429608 is a deficient number, since it is larger than the sum of its proper divisors (17875922).

20429608 is a wasteful number, since it uses less digits than its factorization.

20429608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553707 (or 2553703 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20429608 is about 4519.9123885314. The cubic root of 20429608 is about 273.3715684499.

The spelling of 20429608 in words is "twenty million, four hundred twenty-nine thousand, six hundred eight".