20629660 has 12 divisors (see below), whose sum is σ = 43322328. Its totient is φ = 8251856.

The previous prime is 20629657. The next prime is 20629691. The reversal of 20629660 is 6692602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515722 + ... + 515761.

It is an arithmetic number, because the mean of its divisors is an integer number (3610194).

Almost surely, 2^20629660 is an apocalyptic number.

20629660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20629660 is an abundant number, since it is smaller than the sum of its proper divisors (22692668).

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

20629660 is a wasteful number, since it uses less digits than its factorization.

20629660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031492 (or 1031490 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20629660 is about 4541.9885512846. The cubic root of 20629660 is about 274.2609799641.

The spelling of 20629660 in words is "twenty million, six hundred twenty-nine thousand, six hundred sixty".